Previously, we described a new way of assessing tar and nicotine yields obtained under natural smoking conditions. This first study showed a concordance between the ISO yields and the average yields obtained under natural conditions by usual full flavour cigarette smokers (n=61), with huge inter-individual variations. The aims of the present study were :· To compare the smoking behaviour of usual Full (F), Light (L) or Superlight (S) cigarette smokers· To assess their respective average tar and nicotine yields obtained under natural conditions · To compare these yields one with another or with the respective ISO yields. We asked 90 usual smokers of 3 main commercial brands of F, L, or S cigarettes in France to participate in the study. No inter-group difference appeared in the cigarette daily consumption. First of all, we analysed each subject's smoking behaviour by using a Smoking Puff Analyser. We observed no inter-group difference in the number of puffs or the interval between puffs but mean puff volume was signifcantly higher in the S group than in F or L. Duplication of each smoking profile was performed as a second step in order to determine the yields obtained under these laboratory conditions. Results for tar and nicotine yields were F>L>S. We used these first laboratory results to evaluate the yields in natural conditions as described earlier. Once again, we observed that usual Full cigarette smokers produce an average of 11.7 mg tar and 0.87 mg nicotine, with no significant difference from the ISO yields. The usual Superlight cigarette smokers produce significantly much less tar and nicotine than the F group, even though the decrease is not as large as suggested by the ratio of ISO yields.