Very funny cartoon, by the way.
As for smoking, I'll never light up a cigarette. My grandma smoked for God knows how long but when her third grandchild (yours truly) popped up, she decided to quit. If my life means enough to make someone else quit, why should throw it away by smoking myself? My grandpa smoked as well, and when he died, he died with a non-productive hacking cough, one lung, and no bladder. The lung and bladder were lost because of cancer, and the cough was obviously from the years of smoking.
I'll give smokers like Mackintosh credit, at least you're trying to quit and smoke occasionally, I suppose that's the lesser evil than chain smoking. It's just frustrating when someone tells a smoker all the imminent risks and that he/she should quit, the smoker just says "I know, I know." IF YOU KNOW, THEN DO IT.