I'd drink every day if it weren't for health effects and cost. Although some types of spirits can be cheap enough without being instantly puke-inducing or horribly hangovergenic, so cost is only a minor issue. Just mix in some fruit juice (cheap fruit juice, of course) and you're good to go. But my general sleep quality is already bad on its own, and any time I drink alcohol there's a risk that it will go on to completely ruin it. It not only gets me (physically and mentally) tired over the next week or so, but also moody.
Any kind of wine makes me instantly nauseous (even the smell). I think I was 15 the first time I tried spirits (and then after that I kept drinking a sip here and there), but I only tried beer for the first time when I was 20 or so, as it didn't smell good. I've since discovered that there is good beer, and I like to drink a bottle or two by myself once in a while (back in college, for a while, these "one or two" bottles were more like "three to six", once or twice every week). I have been heavily drunk a few times (not many), but never by myself (which means it hasn't happened in a long while now).
I've been trying several types of medication recently (most of which don't go along with alcohol), so I have barely drunk any alcohol in the past twelve months or so. I get by with my daily sleeping pills. Their effect is somewhat similar to alcohol, but instead of worsening my sleep they help me sleep better. And they're not expensive. And unless I skip a dose, there doesn't seem to be any side effects. (If I do skip a dose, hell breaks loose.)