I stopped about 18 years ago from 20-40 a day. Two old biddies lived in the flat below mine. I had a panic call. Went down to help. These two had been partners since they met in the war. One smoked, one didn't. The smoker was dead on the sofa. I put her on the floor and gave her mouth to mouth and cpr until the ambulance came, which seemed like a hell of a long time. She still had a faint pulse when they took over and they took her away. After a while i went back upstairs and had a fag on the roof garden, put it out and stopped. (The old bid was doa at the hospital, suspect they just didn't bother once the ambulance set off...)
I've had a very occasional spliff or roll up at festivals since.
So just follow old smokers around, wait 'til they have a heart attack, then inflate the corpse for 15-20 mins. With a bit of practice it'll put you right off...