This argument is fallacious, I believe, because there are many things that changed from one cohort to the next. The introduction of cigarette filters is only one such change. To assume that any observed changes in cancer risk from one cohort to the next must be attributable to one particular change - the filter - is not appropriate, in my view.

It is beneficial to make sure the nicotine liquid you buy is made of quality ingredients and under strictly controlled conditions. If you buy the cheapest e-liquid, you will get the cheapest e-liquid. Most reputable nicotine liquid suppliers will explain what is in their nicotine liquid and what conditions their e-juice is mixed under.

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

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