For example:

A third major advantage of a clinical trial is that conditions are controlled as carefully as possible, minimizing potential biases. Both sampling and measurement bias are greatly reduced, if not eliminated. In contrast, survey studies are generally subject to significant sampling and measurement bias.

Furthermore, the web site to which Wimmer links (NEwhere) does not claim that electronic cigarettes are safe. Instead, it suggests that they are safer than cigarettes. In fact, NEwhere acknowledges that electronic cigarettes are not 100% safe, as they do deliver formaldehyde. It its customers that: "electronic cigarettes are not a panacea for smokers. Electronic cigarettes do still contain the harmful chemical formaldehyde in their vapors."

It is difficult enough for youth to initiate cigarette smoking because of the harsh taste of the smoke. This is precisely why menthol cigarettes are so popular among youth. Menthol acts as an anaesthetic which makes it easier for a new smoker to tolerate the harsh taste. For smokeless tobacco products, adding flavorings appears to make these products more appealing to youth, probably for this very reason.

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