The key qualifier is "for the right smokers." There is a subset of smokers who try electronic cigarettes and find them satisfactory. They may then go on to make a decision to try to quit using e-cigarettes. The results of this study do not imply that if a smoker were "forced" to use e-cigarettes to quit, one would find the same favorable results.

"Thanks again for making time to see us, this is an area of much focus globally and we are committed to bringing these products to market and so reducing the harm caused by smoking in the population," the letter said.

Sidney et al. found that among women, lung cancer risk was for lifelong smokers of filtered cigarettes than smokers of non-filtered cigarettes: "in long-term (> 20 years) smokers, the risk of lung cancer was decreased in women who had smoked filtered cigarettes for 20 or more years relative to lifelong smokers of unfiltered cigarettes (RR = 0.36, CI = 0.18-0.75)."

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