A large dose of magic mushrooms I ground up and took with lime juice (making it hit even harder) of a particularly potent strain. Long story short, they permanently took away any pleasure I get from smoking, and increased how much happier I feel without cigarettes. I could go into detail about what the trip was like, but a TL;DR was I was tormented by them, told I'm "stuck in their domain now with no way to get out, stuck here to be mentally ripped apart", and made to beg for sobriety and never do drugs again. Truth be told I've never wanted to sober up so damn fast, but it was worth it in the end because it changed my view around smoking enough to make me decide to quit. I didn't prep, I just took my cigarette pack and lighter and dropped it somewhere on the ground for somebody else to keep. Withdrawals are awkward, my muscles occasionally tickle and sometimes I get murderously angry, but small amounts of weed completely get rid of that for a few hours. The main advice I can give is to recognize the desire to smoke as a separate entity to what you yourself want, and to relish in the withdrawal symptoms, knowing it's nothing more than awkward healing. Similar to telling a child once they finally vomit, they'll feel better, even though the idea of vomiting is quite stressful. Mindset is the difference between making quitting smoking borderline impossible, and just really awkward and uncomfortable. That's all I've got.