I don't know if there is an electronic version available, but all smokers who are serious about the truths behind the medicinal qualities as well as any damaging effects of cannabis should check out Marijuana Reconsidered.
Marihuana Reconsidered http://www.amazon.com/Marijuana-Reconsidered-Grinspoon/dp/0932551130
No one should die before reading a carl sagan book - maybe this one will be helpful. Otherwise I find that understanding my depression (i.e. read books on the brain) helps me avoid some of the mistakes I normally make that causes everything to spiral out of control.
I haven't, but I do love a good pro-cannabis book. I plan on buying Marihuana Reconsidered by Dr. Lester Grinspoon M.D. It's a classic