Harris et al., in perhaps the most comprehensive and definitive on this issue, found a clear increase in cancer risk associated with non-filtered cigarettes. As they reported: "Compared with smokers of medium tar (15-21 mg) filter cigarettes, risk was higher among men and women who smoked high tar (> or = 22 mg) non-filter brands (hazard ratio 1.44, 95% confidence interval 1.20 to 1.73, and 1.64, 1.26 to 2.15, respectively)."

"And most importantly, you are not just anecdotes. Each one of you is a real, courageous person who has accomplished one of the most difficult personal struggles that a person can face in terms of health behavior: quitting smoking, one of the strongest and most powerful addictions. Congratulations!"

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