My parents smoked when I was a kid, then around 1976-7 they started running commercials very heavily about the dangers of smoking and I asked them why they would do that to themselves, convinced that they were going to leave me an orphan. They quit until 1997 when my sister was killed in a car accident. I guess it helped with the stress and depression and I was past the 'orphan' stage. My dad smoked until he died of a brain aneurysm in 2010 and my mom quit again soon after. We've never talked about why but if I had to guess, she might have overheard my daughters complaining about grandma being smelly. She moved back down from Oregon to spend time with them and knew that smoking was messing up the quality of that time, as well as possibly the length of that time.