That's a very interesting, but completely ad-hoc theory. The problem with these is that there are almost always equally plausible theories, and it's really har

That's a very interesting, but completely ad-hoc theory. The problem with these is that there are almost always equally plausible theories, and it's really hard to figure out which is correct. Especially given the huge amount of effort that has gone into research on tobacco and nicotine (I guess millions of hours, if not more), I would definitely NOT say we are too quick to dismiss the possibility. I'm sure you can find an interesting econometric paper presenting this argument, but then it would be more credible.