Comment by chimeracoder

A friend of mine is a psychiatrist who specializes in treating ADHD. She told me about a conference she went to recently, where someone presented an interesting paper.

Apparently, there was an amazing study done relatively recently (last five years), in which they demonstrated that, in mice, exposure to nicotine during pregnancy results in higher rates of ADHD in the grandchildren (passed down through the female offspring exposed to nicotine in utero, not the males).

I can't find the study at the moment, but the findings would be monumental if they also apply to humans too.