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Table 2 Smoke exposure measures and CO boost, by type of cigarette smoked; 2nd, 3rd, 4th cigarettes averaged

From: Hand-rolled cigarette smoking patterns compared with factory-made cigarette smoking in New Zealand men

Averages, per cigarette (standard deviations) Smokers of Roll-your-own (RYO) cigarettes
n = 26
Smokers of Factory-made (FM) cigarettes
n = 22
p value for the RYO – FM difference of means
Weight of tobacco mg per cigarette 496.5 (7.47) 695.3 (15.0) <0.001*
Net weight of tobacco burnt, own cigarette brand, mg 400.3 (48.4) 552.4 (87.8) <0.001*
CO increase per cigarette, ppm 4.37 (2.06) 4.24 (2.52) 0.846
CO ppm increase per g of tobacco burnt; 10.82 (4.98) 7.60 (4.26) 0.021*
Total smoke inhaled per cigarette (total puff volume) mL 952.1 (387.7) 742.6 (188.8) 0.025*
Smoke inhaled in mL, per g of tobacco burnt 2392.6 (1013.0) 1356.0 (321.4) <0.001*
Smoke inhaled per day mL # 18803 (13030) 13242 (6738) 0.077
Puffs per cigarette, count 16.9 (5.2) 13.6 (5.4) 0.035*
Smoke volume per puff, mL 57.3 (17.1) 58.9 (16.8) 0.744
Smoke flow mL/second 33.9 (10.4) 35.2 (9.3) 0.663
Smoke peak flow ml/second 51.0 (18.2) 51.4 (14.0) 0.928
Duration per puff seconds 1.72 (0.40) 1.77 (0.45) 0.664
Average inter-puff interval, seconds 16.67 (9.44) 18.67 (7.11) 0.419
Time puffing per cigarette, seconds 28.4 (9.1) 22.4 (5.9) 0.012*
Puffing as % of time smoking 11.67 (4.51) 10.24 (3.58) 0.235
Minutes smoking, per cigarette 4.29 (0.99) 3.86 (0.96) 0.139
Cravings from after 1st to after 4th cigarette 24.2 (28.2) to 10.1 (21.6) 19.8 (25.2) to 6.1 (9.1) 0.332
  1. *p values (statistically significant at p =< 0.05) are based on Chi-squared tests for categorical measures and independent t-tests for continuous measures.
  2. # Product of smoke volume per cigarette and number of cigarettes per day (from Table 1).