[tomjen3]

I must admit I have tolerance for that bullshit. The cigs don't contain any of the dangerous chemical in a cigarette - you don't need a study to prove they are safe, you just need a decent understanding of chemistry.

But a million anti-smoking advocates don't give a shit.

[Iftheshoefits]

The set of chemicals in cigarettes that are dangerous is a subset of all chemicals known to be dangerous. One can conclude something quite important from that fact without any understanding of anything other than basic reasoning skills.

[bashinator]

If nicotine isn't harmful in itself, why does chewing tobacco cause cancers of the mouth?

[radio4fan]

Because there are more than 70 carcinogenic compounds in tobacco.

[jlgreco]

Are nicotine skin patches causing an epidemic of skin cancer where they are placed?

Not all side effects are caused by the active ingredient.