No one in my family smokes but my childhood best friend's mom smoked a lot inside their apartment (not a very big space), and I spent so much time over there. I

No one in my family smokes but my childhood best friend's mom smoked a lot inside their apartment (not a very big space), and I spent so much time over there. It was sad, they always had a smell about them because of this. They were indoor kids and I spent years of my youth at their place playing video games and D&D. I didn't know any better as a kid but I think back on it and wonder how much that affected my lungs. I stopped going over so much around my senior year of highschool (mid-90s) and then eventually lost touch in the late 90s because our lives went in different directions so my lungs have probably recovered a lot from whatever damage that did. Now I hate the smell of cigarette smoke and can smell it from a good distance away.