One of them; their are over ten sub-types of the nicotinic acetylcholline receptor; really fascinating. Good advice.
As far as dietary restrictions go, selegiline is probably the most liberal, especially if one uses a transdermal patch. That said, as stated above it becomes dangerous in this respect at higher doses.
And just as well I had horrible withdrawal upon stopping, mostly mental, but that may have been because I was in need of it. I found it more effective than SSRIs, though slightly different. Everyone reacts at least slightly differently.
Really? I thought at lowish doses ~20-40mg dextroamphetamine was fairly benign. And I would wager bupropion is a more safe bet if you're looking to stay off drugs; a lot of addicts when given a substitute just abuse that and/or keep on using. No offense, but just look at the people on this site who use suboxone or methadone to merely maintain when they have no heroin, then go back to using.