Addiction to deadly nicotine. That's the battle cry you hear from prohibitionists high and low. But are either of those things true? Not really. My good friends over at the Ashtray Blog interviewed an expert on nicotine who asserted that nicotine on its own is not as addictive as cigarettes or particularly harmful.
Nicotine itself is not causing harm, particularly in people used to it like smokers. They become rapidly tolerant to its effects. The only remaining question is what long-term effects of inhaling pure nicotine could cause. We don’t have the answer yet in humans, even if some vapers are using it for many years now. To date we have not seen any adverse effect.
But we have some evidence from a study in rats, that exposed them to pure nicotine inhalation for 2 years (equivalent to a human life for a rat). The results showed no adverse effects on any organ (no carcinogenic effect, no pulmonary effects, no cardiovascular effects). The only difference noted between rats who where exposed to nicotine and control rats, was that nicotine exposed rats weighted less than control rats. This is also the case in smokers as we know, they weight less than they would weight as non smokers.
You should just click the link and read the interview, it's pretty good stuff. Particularly when he notes that anti-smoking activists need more education.