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

Some knowledgeable analysts have predicted that if promoted, electronic cigarettes could actually replace nearly half of the combustible tobacco cigarette market. This would be the greatest public health achievement of my lifetime. Sadly, the American College of Chest Physicians and its partners do not want to see this happen. They would rather stick with the status quo, where smokers will continue to die in the millions each year, but at least they will not be taking any "unknown" risks.

I find quite sad that an article needs to be published imploring tobacco control researchers to be honest and rigorous and to use good scientific practice and draw conclusions based on evidence rather than emotions.

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