(no my OC, I am attempting to help spread this that I saw first on https://programming.dev/post/33666663 because I think it helps to know that it is not too late to make changes even for major things like smoking and our health!)
There are other health effects than heart issues examined here - e.g. there's cancer, which occurs due to changes in the DNA of your cells, and that is a cumulative process (although e.g. outer skin layers replenish so in 15 years not the same cells, but I am not sure how long lung and other cells take to similarly replenish).