Varenicline
"I'm a retired professional firefighter / paramedic, my whole career I smoked and tried to quit several times because I knew smoking was bad for my health. Even in paramedic school the teachers would be talking about how bad smoking was for me, I'd be constantly be looking at the clock waiting on break so I could go smoke. We would run medical calls on people with "copd" (emphysema) and I'd vow that I was going to quit but as usual I couldn't, we would go on fire calls and after the fire was over the first thing I would do was to light a cigarette and that was an ongoing thing for years and years, after retiring I heard about a new thing called chantix and went to my doctor for a prescription. It was amazing the cravings went away and I quit"