tobacco companies don't add MAOI to cigarettes, it comes naturally as part of the minor alkaloids in tobacco. Nicotine makes up about 95% of the alkaloids with 4 or 5 others making up the other 5%. It is possible BT enhanced the effect somehow.
Wellbutrin (Zyban) was the only BP product that got me off cigarettes for any length of time in my 43 years of smoking, 3 months. I had no desire to smoke, hand to mouth was broken and I was feeling great about finally being successful. Then my script ran out. Within a week I was climbing the walls and started taking a few drags here and there. Within a couple weeks I was back to full time smoking.
Some of us need those MAOIs to function normally. When I started vaping, I still needed a half dozen cigarettes to feel normal. Once I found Swedish snus, the need for smoking went away and the need to vape constantly went away. I figure I have minor depression in my physiology and there's enough of what I need in 4-5 portions of snus to keep me level. He sounds like he needs more.
I think wellbutrin is used to help break compulsions. I quit biting my nails when I was on it and never started again LOL
And yes some of us benefit from some level of nicotine. I don't think it was entirely false when they used to say that smoking might actually help certain conditions in some way... it's just a deadly delivery system.
Going from the most recent study about nicotine absorption from vaping, if you get more nicotine in 5 minutes of smoking than you do by vaping 18 mg for an hour, my current nicotine level is a small fraction of what it was when I smoked. I am down to 10 mg... and of course there are only so many hours in a day you can vape. But if I always need a little nic in my life to stay on an even keel, I'm ok with that. I might even be ok to switch off with low nic gum sometimes but it isn't sustainably priced like vaping. They charge so much for the stuff that it becomes a burden for long term use. The markup on NRT must be high beyond comprehension.