Table 2 Study characteristics - adults

• Tobacco Use Supplement to Current Population Survey 2002–2003 (TUS CPS)

• n = 15,056

• Follow-up one year later in 2003

Non-user = does not currently use either product, subgroups include never smokers and former smokers

ST user = currently uses chewing tobacco or snuff every day or some days

Cigarette smoker = has smoked ≥ 100 cigarettes in lifetime and currently smokes cigarettes every day or some days

Dual user = ST user + cigarette smoker

Percentages are weighted by census-derived survey weights, and stratified by gender, but not adjusted for other factors.

• Males and females

• Only includes data for adults with baseline and follow-up information (excludes 1.9% of the sample with conflicting smoking information)

• Nationally representative cross sectional survey with longitudinal component in some cycles

• ages 18+

• Nationally representative

• Household interviews at baseline in 2002 with follow-up in 2003 for some participants

• Secondary trial data from Working Well cancer prevention trial – University of Texas MD Anderson Cancer Center and worksites

• n = 1244 tobacco users

• Follow-up four years later

Non-user = has not smoked in past seven days and does not currently use smokeless tobacco

ST user = currently uses chewing tobacco, dip, or snuff

Cigarette smoker = has smoked ≥ 100 cigarettes in lifetime and has smoked in past seven days

Dual user = ST user + cigarette smoker

percentages are unadjusted

• Males

• Only includes employees who remained at their baseline worksite four years later (62% of baseline sample)

adjusted odds ratios, for other analyses (not presented here)

• Baseline in 1990

• Average age = 37.5 years

• Reside in southeastern U.S.

• 52% of baseline dual users had follow up data, compared to 60% of smokers and 66% of ST users.

• Secondary data from Wilford Hall/University of Memphis and Minnesota Smoking Cessation Program

• n = 7865

• Mail-in follow-up one year after military basic training

Non-user = Never smoker + never ST user or never smoker + former ST user

ST user = uses smokeless tobacco at least once per day

Cigarette smoker at follow-up = has smoked at least a puff in last seven days

n/a

percentages are unadjusted

• Males

• Baseline questionnaire in August 1995

• Average age 19.8 years

• Follow-up takes place after an imposed tobacco ban

Never Smoker = has never smoked regularly (at least one cigarette per day)

adjusted odds ratios for other analyses (not presented here)

• Treatment and control groups during a 6-week imposed tobacco ban in August 1996

• U.S. Air Force young adult male recruits who reported being never smokers at baseline

• 96% of smokers and 66% of nonsmokers had follow-up data from parent study

• Follow-up excludes those who dropped out of basic training, completed training but dropped out of the survey, were deceased, or on assignment)