I think there are other causes and we just automatically make that link!
It could be caffeine or nicotine or nerves.. some people have more of a tendency to have tremors than others..
And a lot of us, I'm noticing, will still have tremors when we think about drinking sometimes. Last Saturday I smelled red wine and didn't feel anything, but yesterday, the memory of that smell caused a bit of a tremor until I took a couple cleansing breaths and focused on something else.