A cross-sectional survey of experts’ opinions about the relative effectiveness of tobacco control strategies for the general population versus disadvantaged groups: what do we choose in the absence of evidence?
© Paul et al.; licensee BioMed Central Ltd. 2013
Received: 7 August 2013
Accepted: 27 November 2013
Published: 8 December 2013
There is a clear disparity in smoking rates according to social disadvantage. In the absence of sufficiently robust data regarding effective strategies for reducing smoking prevalence in disadvantaged populations, understanding the views of tobacco control experts can assist with funding decisions and research agendas.
A web-based cross-sectional survey was conducted with 192 respondents (response rate 65%) sampled from the Australian and New Zealand Tobacco Control Contacts list and a literature search. Respondents were asked to indicate whether a number of tobacco control strategies were perceived to be effective for each of: the general population; Aboriginal and Torres Strait Islander people; those with a low income; and people with a mental illness.
A high proportion of respondents indicated that mass media and increased tobacco taxation (84% and 89% respectively) were effective for the general population. Significantly lower proportions reported these two strategies were effective for sub-populations, particularly Aboriginal and Torres Strait Islanders (58% and 63% respectively, p’s < .0001). Subsidised medication was the only strategy associated with a greater proportion of respondents perceiving it to be effective in disadvantaged sub-populations compared to the general population. Tailored quit programs and culturally relevant programs were nominated as additional effective strategies for disadvantaged populations.
Views about subsidised medications in particular, suggest the need for robust cost-effectiveness data relevant to disadvantaged groups to avoid wastage of scarce tobacco control resources. Strategies perceived to be effective for disadvantaged populations such as tailored or culturally relevant programs require rigorous evaluation so that potential adoption of these approaches is evidence-based.
KeywordsSmoking cessation Vulnerable populations Expert opinion Socioeconomic status Indigenous health Mental illness Low income population
Despite long-standing tobacco control efforts, a persistent socioeconomic gradient in smoking prevalence exists in a number of western countries [1–3]. In Australia, markedly higher smoking rates are found among highly disadvantaged groups including Aboriginal and Torres Strait Islander people (38%), individuals who are unemployed or with a low income (25-30%) and people with a mental illness (36%) compared with the general population (15.1%) [4–6]. There is also evidence of a prevalence gradient within disadvantaged groups. For example, Aboriginal and Torres Strait Islanders typically experience several types of disadvantage, with research showing increasing smoking prevalence as a function of decreasing household income . Effective tobacco control initiatives which address smoking in all socioeconomic groups are critical to addressing this social disparity.
There is growing debate about how to best address disparities in tobacco use and subsequent health outcomes [8–10]. Behavioural interventions have shown promise amongst some disadvantaged groups although the evidence is mixed . There remains a lack of robust evidence about the effectiveness of a number of tobacco control strategies for disadvantaged groups [11, 12]. Evidence on the relative effectiveness of major strategies such as mass media and telephone support does not address the full range of disadvantaged groups, so is insufficient for decision making and policy development. For example, studies of the effectiveness of anti-tobacco mass media campaigns across socioeconomic groups commonly omit the highly disadvantaged . Inter-group comparisons of the relative effectiveness of population-based strategies have focussed on gender, age and some racial groups rather than Indigenous status, poverty or mental health .
The lack of methodologically rigorous evidence about the most effective tobacco control strategies for redressing the socioeconomic gradient in smoking rates can impede decision making, funding and agenda setting. Consequently, decisions can be easily influenced by individual opinion. In the absence of robust trial data, representative data on the views of relevant stakeholders can be helpful in guiding decision making, setting a research agenda or simply understanding where resources are likely to be channelled in the absence of evidence. While little is known about the views of experts, views about effective tobacco control strategies have been sought from disadvantaged smokers. For example, remote indigenous community members indicated brief advice and pharmaceutical quitting aids were perceived as important and effective, as was introduction of smoke free areas . In contrast, there were conflicting views on Quit programs and tobacco taxation increases. Qualitative and quantitative studies of disadvantaged groups attending social and community service organisations have identified financial or material incentives and subsidised pharmacotherapies as popular choices for cessation support [15, 16]. Understanding the views of the tobacco control community is important not only to assist with decision making, but to understand the perceptions guiding current decision making, and identifying targets for strategic research funding.
Perceptions of the effectiveness of i) Population-level strategies such as mass media campaigns, taxation increases, limits on expenditure of government payments; and ii) Cessation support such as telephone or SMS cessation support, subsidised pharmacotherapies and web-based cessation programs; for the general population and for each of three socially disadvantaged groups: Aboriginal and Torres Strait Islander people, those with a low income and people with a mental illness.
Additional strategies perceived to be effective for these disadvantaged groups.
An online cross-sectional survey was conducted in September and October, 2011.
Two hundred and ninety two people listed on the 2011 Australian and New Zealand Tobacco Control Contact List were invited to participate in an online survey. The Australian and New Zealand Tobacco Control Contact List is a directory of individuals working in tobacco-related research, advocacy, tobacco control policy and program delivery. We identified additional relevant contacts by conducting a PubMed search using the following search parameters (Australia and/or New Zealand) and (Smoking and/or tobacco control) for articles published between 1/1/2008 and 31/12/2010. We included 51 additional individuals with Australian or New Zealand affiliations who were listed as one of the first three authors on at least three relevant publications, and were not already listed on the Australian and New Zealand Tobacco Control Contact List.
Participants were invited to complete an anonymous web-based survey hosted by Survey Monkey™. Potential respondents were sent an email explaining the purpose of the survey, how they were chosen to participate, and inviting them to complete the survey by clicking on a weblink. All non-respondents received a reminder email one week after the initial invitation, and an additional reminder telephone call (or email if not contactable by telephone) 7-10 days after the reminder email was sent. Ethical approval was obtained from the University of Newcastle Human Research Ethics Committee.
Web survey items
The survey contained 11 items exploring views about the degree to which tobacco control efforts should focus on whole population approaches versus focusing on disadvantaged groups. Data from survey items on the resourcing of tobacco control mass-media campaigns and research priorities are reported elsewhere . Data for four items on the perceived relative effectiveness of tobacco control strategies are reported here. For each group of interest (General population, Aboriginal and Torres Strait Islander People, People with a Low Income and People with a Mental Illness), respondents were asked “Which of the following strategies do you think will be effective for reducing smoking prevalence?”. Respondents could select from eight response options: ‘Mass media campaigns’, ‘Increased taxes on tobacco’, ‘Ensuring government payments (e.g. Centrelink) cannot be spent on tobacco’, ‘Telephone or SMS support (e.g. Quitlines)’, ‘Web-based approaches’, ‘Subsidised medications (e.g. Nicotine patches)’, ‘None of the above’ or ‘Other’-specify. Respondents could select more than one strategy.
Descriptive statistics including means and medians were used to explore the data. Although most of the data were normally distributed, in a few instances responses were skewed. Logistic regression within a Generalised Estimating Equation (GEE) framework was used to make comparisons regarding the proportions of respondents replying in the positive for effectiveness to each particular strategy. P values reported from the GEE are from a test of the comparison of ‘yes’ responses to each population compared to a ‘yes’ response to the general population.
Demographic characteristics of respondents
% of respondents
Other Australian states
Service or program management
Service or program delivery
Proportion of work role focused on disadvantaged groups
Half or less
More than half
Experience in tobacco control
Perceived effectiveness of specific strategies for each group of interest
Other strategies perceived to be effective for specific populations
Additional tobacco control strategies perceived to be effective for different population groups
Extension on smoking bans in public areas
Advertising restrictions/plain packaging
Reducing locations of sale
Aboriginal and Torres Strait Islander peoples
Community based strategies
Involvement of elders and others in strategy development and education
Tailored quit programs
Using culturally relevant information to inform strategies
Targeted media campaigns
Restricting availability of tobacco products
Interventions involving health professionals
Low income populations
Extension on smoke free environments
Tailored quit programs
Advice and support from health professionals
Restricting availability of tobacco products
People with a mental illness
Tailored quit programs
Intensive support from health professionals and services
Extension on smoke free environments
This survey of key tobacco control stakeholders found high levels of perceived effectiveness of population-based strategies including mass media campaigns and increased taxes for the general population. Fewer respondents were convinced that these strategies would be effective for disadvantaged sub populations with high smoking rates. In general, the number of years working in tobacco control did not affect perceptions of strategy effectiveness. The one exception to this was that those with more experience were more likely to rate increased taxes on tobacco as an effective strategy for Aboriginal and Torres Strait Islander peoples and people with a mental illness, compared to those who had not been working in tobacco control for as long.
Approximately half of the sample considered mass media to be effective for Aboriginal and Torres Strait Islander peoples and people with a mental illness, significantly lower than the 84% perceiving an effect for the general population. It is not possible to judge whether respondents believed this was due to the medium (e.g. television) or the message (e.g. lack of culturally relevant actors or issues). However, the data suggest that one of Australia’s largest tobacco investments is not therefore, considered to be an avenue for reducing the social disparity in smoking rates. While there are data to suggest that mass media can be effective for lower income groups , the issue of differential effectiveness of mass media for very disadvantaged groups has not been adequately addressed in the literature . Recent Australian campaigns aimed at delivering culturally-appropriate mass media tobacco control messages for Aboriginal people require sound evaluation and dissemination of data to ensure the tobacco control community is aware of developments in this area [18, 19].
Similarly, widely available cessation strategies such as telephone, SMS, and web-based programs were perceived by a much lower proportion of respondents to be effective for disadvantaged groups (16%-52%) than for the general population (35%-61%), most notably for Aboriginal and Torres Strait Islander people. A survey of low-income clients accessing social and community support organisations, also found low levels of support for receiving smoking cessation advice via Quitlines or SMS services . Given that telephone, SMS and web-based support are the most promoted and available forms of cessation support in Australia, there is a need for robust research demonstrating whether very low levels of relative effectiveness are the case for such groups compared to the general population. If this is the case, it is necessary to develop effective strategies for improving the reach, efficacy and effectiveness of cessation support strategies for groups with particularly high smoking rates. One Australian trial of the telephone support service (Quitline) with a disadvantaged sample found no evidence of effectiveness at 12 months follow-up . More recent evidence also suggests lower levels of engagement and less effectiveness for Aboriginal and Torres Strait Islander people accessing the Quitline , a finding which is echoed by a survey of Indigenous community members and health workers, suggesting unmodified Quit programs may lack appropriateness in such settings .
In contrast, ensuring government payments are not spent on tobacco was perceived by more respondents to be effective for each disadvantaged group than for the general population. However, the levels of endorsement were low (20%-35%), suggesting this was not an approach that would be broadly supported by the tobacco control community. Subsidised medication was the sole instance where the proportion who perceived this strategy to be effective was high (72-84% of respondents) for all population groups, with higher proportions of endorsement for some disadvantaged groups than for the general population. This suggests the respondents perceive addiction or finances (or both) to be of major importance in reducing smoking in disadvantaged groups. Given the high cost of this approach and concern about the real-world effectiveness of pharmacotherapies [22, 23], careful testing of the relative cost-effectiveness of medications for disadvantaged versus general population groups is needed.
Also of interest are the additional strategies nominated by respondents as potentially effective as an indication of what key stakeholders may endorse or advocate. Increased restrictions on smoking in public areas were nominated as likely to be effective for all groups other than for Aboriginal and Torres Strait Islander people, while tailored quit programs were suggested for each disadvantaged group. Tailoring of cessation programs to disadvantaged populations has intuitive value, particularly for Indigenous groups given the unique social and cultural factors which influence smoking behaviour in this population . Evidence regarding tailored cessation programs in disadvantaged populations is limited, and has been the subject of some debate particularly in relation to tailoring for Indigenous populations. One review advocated for the development of tailored and targeted approaches to smoking cessation , while another review argued that not all smoking cessation programs need to be culturally adapted to be effective . However, both reviews only included a small number of studies, suggesting further research is necessary to fully inform the tobacco control community on the value of tailored programs. In relation to people with a low income or mental illness, programs delivered by health care providers and service providers were nominated. While there is a growing evidence base in this field [27–31], this work is in its infancy. The dissemination of effective approaches should also be studied, given the identified challenges in achieving high rates of cessation advice in primary care . Strategies nominated as likely to be effective for Aboriginal and Torres Strait Islander people suggest community-based, culturally relevant approaches that involve elders and other community leaders are preferred. Given the weakness of the evidence-base around culturally-relevant programs , it is important to establish robust science around the implementation of cultural relevance to ensure tobacco control programs for Aboriginal and Torres Strait Islander people provide the greatest possible benefit.
When considering the evidence for the effectiveness of strategies for Aboriginal and Torres Strait Islander people, it is important to consider the implications of this for the Indigenous population of New Zealand. The Maori population makes up a larger proportion of the New Zealand population (approximately 15%)  compared to Aboriginal and Torres Strait Islanders, who make up approximately 2.5% of the Australian population . However, both Indigenous populations experience many health disparities compared to the non-Indigenous population including a significantly lower life expectancy, and a higher smoking prevalence [35, 36]. Therefore it remains important to continue research into effective strategies for promoting smoking abstinence in these populations, and where possible, identify approaches that are most effective and acceptable for each group.
The interpretation of these findings should take into account some limitations. Firstly, although the response rate is acceptable, it does not preclude response bias. It is possible that those who did not respond may have expressed different views to those of the respondents. Those working with disadvantaged groups may have been more likely to respond than those without such involvement, and so may have stronger views about the needs of such groups in relation to tobacco control strategies. Furthermore, it is acknowledged that this survey was conducted at a time in which the Indigenous tobacco control workforce was undergoing substantial change and growth. As such, some of these workers may not have been on the contact list, and therefore would not have been invited to complete the survey.
It is also likely that the sample was heterogeneous in terms of familiarity with data about the effectiveness of the various tobacco control strategies. While the heterogeneity of the sample may be considered a limitation, it may also be considered a study strength. It should also be noted that no explanation was provided regarding definitions of the sub populations. This may be a concern in relation to interpretation of the term ‘low income’ which can be interpreted as less than average income or below the poverty line which are quite different groups, the latter of which is not well-reflected in studies of the effectiveness of increased taxes on smoking cessation . These groups also have significantly different smoking prevalence rates- 24.6% in the most disadvantaged quintile , compared to 61% among individuals with multiple forms of disadvantage accessing social and community service organisations . As the survey did not provide respondents with a definition of low income, it may be that their responses reflect wide variations in definitions of low income groups.
In order to produce an evidence base for tobacco control policy and service delivery it is important to understand and address the views of the tobacco control community. Given the lack of robust evidence about intervention effectiveness for more disadvantaged smokers , a sizeable research effort is needed to reduced smoking rates among disadvantaged groups. The views of those engaged in tobacco control in Australia and New Zealand suggest the need for a targeted research agenda to establish whether current tobacco control strategies such as mass media and telephone support can become substantially more effective for disadvantaged groups than is currently perceived to be the case. Given these views may be at odds with the emphasis on mass media approaches within the Australian National Tobacco Control Strategy, there may be a need for closer engagement between policy makers and those working with disadvantaged groups. The popularity of subsidised medications requires robust cost-effectiveness data to determine population-specific cost-effectiveness. Other strategies likely to be popular for reducing smoking disparities such as tailored programs and culturally relevant programs also require rigorous evaluation.
This research was supported by a Strategic Research Partnership Grant from NSW Cancer Council to the Newcastle Cancer Control Collaborative (New-3C). The kind participation and helpful comments of the survey participants is gratefully acknowledged.
- Glover JD, Hetzel DM, Tennant SK: The socioeconomic gradient and chronic illness and associated risk factors in Australia. Aust N Z Health Policy. 2004, 1 (1): 8-10.1186/1743-8462-1-8.View Article
- Graham H, Inskip H, Francis B, Harman J: Pathways of disadvantage and smoking careers: evidence and policy implications. J Epidemiol Community Health. 2006, 60: ii7-ii12. 10.1136/jech.2004.023531.PubMed CentralView Article
- Wakefield MA, Durkin S, Spittal MJ, Siahpush M, Scollo M, Simpson JA, Chapman S, White V, Hill D: Impact of tobacco control policies and mass media campaigns on monthly adult smoking prevalence. Am J Public Health. 2008, 98 (9): 1443-1450.PubMed CentralView ArticlePubMed
- Australian Institute of Health and Welfare: 2010 national drug strategy household survey report. Drug statistics series no 25. 2011, Canberra: Australian Institute of Health and Welfare
- Australian Institute of Health and Welfare: 2007 national drug strategy household survey: detailed findings. Drug statistics series no 22. 2008, Canberra: Australian Institute of Health and Welfare
- Lawrence D, Mitrou F, Zubrick SR: Smoking and mental illness: results from population surveys in Australia and the United States. BMC Public Health. 2009, 9: 285-10.1186/1471-2458-9-285.PubMed CentralView ArticlePubMed
- Thomas DP, Briggs V, Anderson IP, Cunningham J: The social determinants of being an Indigenous non-smoker. Aust N Z J Public Health. 2008, 32 (2): 110-116. 10.1111/j.1753-6405.2008.00185.x.View ArticlePubMed
- Baker A, Ivers RG, Bowman J, Butler T, Kay-Lambkin FJ, Wye P, Walsh RA, Pulver LJ, Richmond R, Belcher J, et al: Where there’s smoke, there’s fire: high prevalence of smoking among some sub-populations and recommendations for intervention. Drug Alcohol Rev. 2006, 25 (1): 85-96. 10.1080/09595230500459552.View ArticlePubMed
- West R, McNeill A, Britton J, Bauld L, Raw M, Hajek P, Arnott D, Jarvis M, Stapleton J: Should smokers be offered assistance with stopping?. Addiction. 2010, 105 (11): 1867-1869. 10.1111/j.1360-0443.2010.03111.x.View ArticlePubMed
- Paul CL, Bonevski B, Turon HE, Bryant J: The balancing act: Experts’ opinions about the relative resourcing of tobacco control efforts for the general population versus disadvantaged populations. Drug Alcohol Rev. 2012, 31 (5): 602-607. 10.1111/j.1465-3362.2012.00454.x.View ArticlePubMed
- Bryant J, Bonevski B, Paul C, McElduff P, Attia J: A systematic review and meta-analysis of the effectiveness of behavioural smoking cessation interventions in selected disadvantaged groups. Addiction. 2011, 106 (9): 1568-1585. 10.1111/j.1360-0443.2011.03467.x.View ArticlePubMed
- Guillaumier A, Bonevski B, Paul C: Anti-tobacco mass media and socially disadvantaged groups: a systematic and methodological review. Drug Alcohol Rev. 2012, 31 (5): 698-708. 10.1111/j.1465-3362.2012.00466.x.View ArticlePubMed
- Thomas A, Fayter D, Misso K, Petticrew M, Sowden A, Whitehead M, Worthy G: Population tobacco control interventions and their effects on social inequalities in smoking: a systematic review. Tob Control. 2008, 17: 230-237. 10.1136/tc.2007.023911.PubMed CentralView ArticlePubMed
- Johnston V, Thomas DP: What works in Indigenous tobacco control? The perceptions of remote Indigenous community members and health staff. Health Promot J Aust. 2010, 21 (1): 45-50.
- Bonevski B, Bryant J, Paul C: Encouraging smoking cessation among disadvantaged groups: a qualitative study of the financial aspects of cessation. Drug Alcohol Rev. 2010, 30: 411-418.View ArticlePubMed
- Bryant J, Bonevski B, Paul C: A survey of smoking prevalence and interest in quitting among social and community service organisation clients in Australia: a unique opportunity for reaching the disadvantaged. BMC Public Health. 2011, 11: 827-10.1186/1471-2458-11-827.PubMed CentralView ArticlePubMed
- Durkin SJ, Biener L, Wakefield MA: Effects of different types of antismoking ads on reducing disparities in smoking cessation among socioeconomic subgroups. Am J Public Health. 2009, 99 (12): 2217-2223. 10.2105/AJPH.2009.161638.PubMed CentralView ArticlePubMed
- Boyle T, Shepherd CJ, Pearson G, Monteiro H, McAullay D, Economo K, Stewart S: Awareness and impact of the ‘Bubblewrap’ advertising campaign among Aboriginal smokers in Western Australia. Tob Control. 2010, 19: 83-86. 10.1136/tc.2009.031856.View ArticlePubMed
- Stewart HS, Bowden JA, Bayly MC, Sharplin GR, Durkin SJ, Miller CL, Givans SE, Warne CD, Wakefield MA: Potential effectiveness of specific anti-smoking mass media advertisements among Australian Indigenous smokers. Health Educ Res. 2011, 26 (6): 961-975. 10.1093/her/cyr065.View ArticlePubMed
- Miller CL, Sedivy V: Using a quitline plus low-cost nicotine replacement therapy to help disadvantaged smokers to quit. Tob Control. 2009, 18: 144-149. 10.1136/tc.2008.026492.PubMed CentralView ArticlePubMed
- Cosh S, Maksimovic L, Ettridge K, Copley D, Bowden JA: Aboriginal and Torres Strait Islander utilisation of the Quitline service for smoking cessation in South Australia. Aust J Prim Health. 2012, 19 (2): 113-118.View Article
- Walsh RA: Over-the-counter nicotine replacement therapy: a methodological review of the evidence supporting its effectiveness. Drug Alcohol Rev. 2008, 27 (5): 529-547. 10.1080/09595230802245527.View ArticlePubMed
- Paul CL, Walsh RA, Girgis A: Nicotine replacement therapy products over the counter: real-life use in the Australian community. Aust N Z J Public Health. 2003, 27 (5): 491-495. 10.1111/j.1467-842X.2003.tb00820.x.View ArticlePubMed
- Johnston V, Thomas DP: Smoking behaviours in a remote Australian Indigenous community: the influence of family and other factors. Soc Sci Med. 2008, 67 (11): 1708-1716. 10.1016/j.socscimed.2008.09.016.View ArticlePubMed
- DiGiacomo M, Davidson PM, Abbott PA, Davison J, Moore L, Thompson SC: Smoking cessation in indigenous populations of Australia, New Zealand, Canada, and the United States: elements of effective interventions. Int J Environ Res Public Health. 2011, 8 (2): 388-410.PubMed CentralView ArticlePubMed
- Johnston V, Westphal DW, Glover M, Thomas DP, Segan C, Walker N: Reducing smoking among indigenous populations: new evidence from a review of trials. Nicotine Tob Res. 2013, 15 (8): 1329-1338. 10.1093/ntr/ntt022.View ArticlePubMed
- Baker A, Richmond R, Haile M, Lewin TJ, Carr VJ, Taylor RL, Jansons S, Wilhelm : A randomized controlled trial of a smoking cessation intervention among people with a psychotic disorder. Am J Psychiatry. 2006, 163 (11): 1934-1942. 10.1176/appi.ajp.163.11.1934.View ArticlePubMed
- Bonevski B, Paul C, D’Este C, Sanson-Fisher R, West R, Girgis A, Siahpush M, Carter R: RCT of a client-centred, caseworker-delivered smoking cessation intervention for a socially disadvantaged population. BMC Public Health. 2011, 11: 70-10.1186/1471-2458-11-70.PubMed CentralView ArticlePubMed
- Christiansen BA, Brooks M, Keller PA, Theobald WE, Fiore MC: Closing tobacco-related disparities: using community organizations to increase consumer demand. Am J Prev Med. 2010, 38 (3): S397-S402. 10.1016/j.amepre.2009.11.015.View ArticlePubMed
- O’Brien J, Bonevski B, Salmon A, Oakes W, Goodger B, Soewido D: An evaluation of a pilot capacity building initiative for smoking cessation in social and community services: the smoking care project. Drug Alcohol Rev. 2012, 31 (5): 685-692. 10.1111/j.1465-3362.2012.00464.x.View ArticlePubMed
- Bryant J, Bonevski B, Paul C, Hull P, O’Brien J: Implementing a smoking cessation program in social and community service organisations: a feasibility and acceptability trial. Drug Alcohol Rev. 2012, 31 (5): 678-684. 10.1111/j.1465-3362.2011.00391.x.View ArticlePubMed
- Zwar NA, Richmond RL: Role of the general practitioner in smoking cessation. Drug Alcohol Rev. 2006, 25 (1): 21-26. 10.1080/09595230500459487.View ArticlePubMed
- Paul CL, Sanson-Fisher R, Stewart J, Anderson AE: Being sorry is not enough: the sorry state of the evidence base for improving the health of indigenous populations. Am J Prev Med. 2010, 38 (5): 566-568. 10.1016/j.amepre.2010.02.001.View ArticlePubMed
- New Zealand Statistics: Maori population grows and more live longer. 2012, http://www.stats.govt.nz/tools_and_services/media-centre/additional-releases/maori-population-estimates-15-nov-2012.aspx,
- Australian Bureau of Statistics: The health and welfare of Australia’s aboriginal and torres strait islander peoples, October 2010. 2010, http://www.abs.gov.au/ausstats/abs@.nsf/mf/4704.0/,
- New Zealand Ministry of Health: The health of maori adults and children. 2013, http://www.health.govt.nz/publication/health-maori-adults-and-children,
- Siahpush M, Wakefield MA, Spittal MJ, Durkin SJ, Scollo MM: Taxation reduces social disparities in adult smoking prevalence. Am J Prev Med. 2009, 36 (4): 285-291. 10.1016/j.amepre.2008.11.013.View ArticlePubMed
- The pre-publication history for this paper can be accessed here:http://www.biomedcentral.com/1471-2458/13/1144/prepub
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