I drink probably far more than I should, but I point blank refuse to have anything to do with drugs or tobacco. I don't even like to take paracetemol unless my head is on the verge of disgorging something.
Strangely, the thing I found myself most addicted to was Orange Lucozade. I started using it as a hangover cure, and in that capacity it does marvelous, marvelous work. It's when you realise you're drinking bottle after bottle of the stuff as though it were water that you think you might have a glucosey problem.
A close friend of mine died from alcohol poisoning about two years back. I actually had a drink with him the night before that. I don't think I saw him sober more than about twice in the three years prior to that, and the inquest said that he had a roughly 30% healthy liver at the time of his death. So I've tried to cut back a bit since then. Not easy though. I tend to go for long periods without drink now and then binge as a release, whereas before I would be drinking more slowly over a more extended period. At one point, the first thing I would do after getting out of bed in the morning would be to go downstairs and crack open a can of Strongbow out of the fridge and drinking about half of it at once, to the disgust of my housemates' girlfriend as she poured milk on her cereal. In the year since I've graduated from university, my living arrangements and financial situation have changed, and I'm more self sufficient and better funded, and it's been a struggle not to spend more money on alcohol than I have, but spending most of my days doing 9am to 8pm shifts at work doing manual labour and being too tired to do much of anything when I get home has been a help. Good exercise too.
With those kind of circumstances, I consider my time off with gaming to be a release from those pressures. And not just a casual rampage around Liberty City, as Okami and Sonic Rush achieve the same goal. Still, when The Dark Knight was such an awful movie and a huge letdown, it's hard not to get depressed enough to want to drink again.