[Pay08]

I don't mean any sort of substance, but a habit. That can be consuming something (be it cigarettes or tea) but it doesn't need to be. I used to be in a similar position as you (except with food). I've found that doing something similarly meditative, in my case listening to music, achieves much the same effect as food did.

[asdff]

Nicotine is a bonafide stimulant though, hard to get that any other way.