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 |