I stopped 8 years ago but I reckon that's a personal decision.
I have never really understood why it is wrong to smoke a cigarette which, just maybe, can do damage to someone who happens innocently to be in the vicinity of the smoker while it is OK to drive a car which, undoubtedly, can do damage to someone who happens innocently to be in the vicinity of the driver. The usual argument that the car is "necessary" and that smoking is a "pastime" seems to dump any question of a moral basis to the position out of the window.
Just the personal opinion of a boring old fart.
And by the way, I do have cancer in remission and nothing whatsoever to do with smoking. Do I get my money back?