In order to represent informed consent, there are several other elements which must take place. These are best by Professor James Grimmelmann over at :

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.

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