I've never smoked, but I've been around people that do. What do people feel during/after smoking? It doesn't seem to make people high or hallucinate or anything. It maybe mildly relaxes them?
There is also Chantix/Champex depending on your country. I found it to be extremely effective in turning me off of cigarettes. It made me nauseous and I think it changed how my brain felt about cigarettes until they disgusted me.