Oh, I forgot to mention my addiction creds...
Smoked, dipped, chewed from about 16 on. Quit several times--all for good reasons, but always started back up, mostly when stress hit hard. Last time I chewed was in the field in Fort Polk back in '98. It was one of those jobs that went from extremely high stress one minute to extreme boredom for hours. I would smoke during the high stress part and chew or dip the rest of the time. I was driving my HMMWV out to the field, had a chew in one cheek and was smoking a cigarette at the same time when something jumped out in front of me. I swerved to miss it and dropped the cigarette on my lap and swallowed the chew. After I pulled over, I spent a few unpleasant minutes, dealing with the burns on my pants and throwing up. When I was recovered enough, I grabbed all the tobacco I had in the truck, which for a 20 day field problem was considerable, and threw them in the nearest crapper. Haven't smoked or chewed since.