What kind of health complications has smoking caused you?

33M, smoke since 17yo. I’m 5 days smoke-free and on the very edge of relapsing.

Smoking has already caused some serious damage to my gums and teeth, and I know I really don’t want to make things worse. But somehow, I still can’t stop thinking about smoking.

For those who have smoked for years: what health problems has smoking caused you? Did quitting make a noticeable difference?

I think I need to hear some of the consequences from people who’ve actually been through it as a reality check, because my mind is tricking me again. :(