I don't know if smoking kills. However, I read a very indepth study on exactly HOW smoking
does the damage it does, to cells, to tissues, etc.
Somebody (who was pro vaping) posted it when I first joined here and it was quite illuminating. Now I can't find it.
My feeling after reading is, seeing exactly what happens from lips to mouth to esophagus/windpipe to lungs and stomach, I would not want to smoke even one cigarette because it DOES do damage. At cell level. And this has been watched using instruments that can "see" what it does.
This is no bash on dual users. If you need to do that, then you need to do that. I am not judging you. But I am saying that I think you are kinda fooling yourself a little by saying "oh 2 a day won't hurt" because you do not know exactly what damage it will do. Will 2 be the number that triggers a *disease process*? Or will it take 10 cigs?
It is a risk, that is what I am saying......and you shouldn't pretend that it isn't.
I do understand though, "damage" is not "death", so I cannot and will not say that smoking kills. There is a whole lot that also has to "happen" for that to happen, and it would be hard to separate that event from a hundred other factors.
But it does do damage. *Each* one. Make no mistake about that.
However, I can say that about strong sunlight and my aging skin. That I've had to have suspicious looking "things" cut off my skin. So, I do avoid the sun at hottest time of day. I would have to live in a bubble to avoid UV entirely of course. With cigs, I feel I have more control. I can just not smoke them at all.
Every individual here is at a completely DIFFERENT level of accepting risk. That is something I have noticed --- and that is why there are so many debates.

nobody has a right to tell others what risks they should or should not accept. That doesn't mean people shouldn't point out their own theories ---- esp. about AVOIDABLE RISKS.
I am dealing with a very difficult situation right now, a family member has a very bad cancer. People say to me all the time "what is the point of taking great care of yourself when you may end up getting cancer anyway?"
The answer to that has been made VERY CLEAR this week: if you are healthy, if you have taken reasonably good care of yourself, then chances are your body will be able to WITHSTAND the rigors of treatment, surgeries, chemos, radiation, etc. In the case of my family member, that may not be the case. Despite not being old, they may even be unable to have the necessary treatments because their heart and some other organs aren't very healthy (years of being sedentary, not exercizing, eating badly, overweight and pre-diabetic, etc.)
So, I say, take as little risk as possible with your health. Because you may
need stellar health in order to deal with a health crisis. You may need every ounce of everything you've got to beat a bad diagnosis. That is just *my* philosophy because I don't take health lightly. To me, it's everything. Once it is gone, so is most of the joy of living.
Hope this makes sense. We may not be able to *avoid* disease process, but if we are strong enough to undergo all the treatments for that disease process, then chances are you will make it out ................... alive.
Perhaps my perspective has been changed as I deal with this tragedy right now, I mean, I'm sure my perspective HAS changed.