Heh... When I saw this topic I thought of a TV show I saw today, where a woman went to a mini bar and asked a man: "What's your poison?" and the man: "You've got any?"
Anyway... I don't drink coffee at all, because it tastes terrible and I rarely drink tea. If I do, I buy it from the Fair Trade Shop. I usually just drink hot water with honey. *yam*
I don't smoke or use drugs, but I do drink alcohol. I love cider (especially pear and my brand is Kopparberg's or Golden Cap), Bailey's, coffee liqueur, other liqueurs...and of course Salmiakki Koskenkorva.

*yam* You poor foreigners who don't understand the pleasures of salmiakki...

My favourite drink could be Blue Angel.
I don't know how harmful they are, but if we're talking about addictions... I'm crazy for Chuba Chubs lolly pops and Tic Tac Oranges... *drools*