Yes I am serious and I meant nicotine. Many ADHD people are already addicts usually the worst form of it: cigarettes. It is a nootropic with a big health tradeoff. So don't consider yourself unmedicated if you are a user.

In my case, cigars help me a lot, much more than dopamine stimulants. I think acetylcholine stimulation should be studied more by the pharma.

Strangely, yes. I can't find a good source for you at present but I've known people who self-medicated this way and it seemed to work for them.

But GP probably meant nicotine.