My dad was a 2 pack a day smoker for 20+ years. Then when I was in Gr.9 his doctor took an x-ray of his lungs & told him "See this, dead within 6 months." He quit cold turkey right then & there.
When he got home & told us, I wrote out a contract that he signed & all of us signed that if any of us ever caught him with a cigarette, even if he was just holding it for a friend, he would have to buy each of us a brand new vehicle of our choice. That would have been the world's most expensive cigarette

Gotta love Grade 9 Consumer Ed.
We never did get our cars but we still have our dad
My uncle, "the Doctor", was over for a dinner party a week later & all my uncles smoke so I asked him very politely not to smoke in front of my dad, since he was trying to quit & his doctor said it would save his life. This uncle decides not to listen to his nephew, whips out a cigarette, lights it & blows smoke rings in my direction. I smiled, went into my room, went to the washroom & filled up my water pistol, & put out his cigarette for him

Shot him full in the face. Boy, did my parents get mad. hehehehehe. Worth it though.
My only regret is that Super Soakers hadn't been invented yet
Anthony