My stepfather was a lifelong smoker. He smoked a full pack of Marlboro reds every day, and my mom smoked a full pack of menthols. I calculated out how much they spent yearly on cigarettes alone and it came to over $5000, and that was in the late 90's; it's probably much higher these days. Both of them had been smoking since the 70's.
When I talked to them about quitting, they both said that they enjoyed smoking too much, it's a stress relief, it's something to do, etc. They were aware of the health risks, but believed the risks were overblown and that emphysema is an "old person's" disease.
Last year he was diagnosed with stage 3 emphysema. The man is a dyed-in-the-wool hard-as-nails army vet boomer, and his obstinate machismo made him ignore years of poor health and lung disease symptoms all to finally end up as an old person with an "old person's" disease. Credit to him though, he did quit cold turkey the day his doctors delivered the diagnosis; the same obstinacy that pushed him to never give up smoking is what pushed him to quit. Me and my family love the hell out of him, and we're glad that he finally quit, but it's so aggravating that there are still so many people out there who discount the risks of smoking.