Yep a smoker, started at 21 and a bit more than ten years later I am still smoking.
I have never been a chain smoker or a 20 a day man and in recent years I seem to be going longer and longer without a smoke if I have something else to do, I won't smoke all day on occasion and then light up when I get home.
Yes it's bad for me in the long run and I should be looking at giving it up all together but apart from that it's never really had an impact on my health and fitness, it will do in the end if I persist into more advanced age with the smoking though.
Whenever I see these smoking threads you always get the thinly veiled references to lack of will power or the seeming instant crippling effects upon your ability to cycle, sadly that's simply not true, every bugger used to smoke once upon a time and that included athletes. That's the problem you see...you can carry on as normal and the diseases creep up on you in later life, the real exception being chain smokers who kick the arse out of the fags from day one.
The people I have met who have the fitness problems and smoke usually do all the other bad things as well such as over eating and not taking enough exercise, which funnily enough makes non smokers just as unfit as well.