I have been (was ?) a passive smoker up until when I became 14 years old. I now have Asthma , probably a result of that.

If you don't know Asthma , try breathing through a juice straw. Feel that? Asthma is worse. Spend a night breathing that way and you will renounce smoking , if other people's well-being is of any importance to you.

Smoking is for losers :)

I'm an active smoker. I started smoking about a year ago. It's definitely bad for health, and I think it's an irresponsible behaviour because it affects other people, who have no choice but to breathe in the second-hand smoke we exhale. Hence I'm often conscious about the direction of my smoke exhalation, and try not to exhale smoke near others. When I just started smoking a year ago, I could feel a sort of "high" in my brain when I take a puff. But this eventually disappeared. I smoke about 5-7 cigarettes a day, 1 every couple of hours. However, when I'm concentrating hard on tasks, or when I'm with family, I can go without smoking for long hours or even the whole day without feeling the urge the smoke (unless I feel terribly, terribly bored). And sometimes when I'm sick, I don't smoke for days! Because of the ability to abstain from them for long hours, sometimes even days, and my extreme dislike towards the taste of cigarettes, I believe that it's not so much the nicotine that keeps me smoking. Rather, it's the action of placing something between my lips and filling my lungs with something. It's all very metaphorical and a little abstract, but "filling up" myself has always been something I do very often due to my depression and the feeling emptiness. I also suffer from an eating disorder, so there's a tiny link betweem my obsession over food consumption and my "consumption" of smoke. Despite knowing these are false consumptions that will never be able to fill that emptiness inside, it continues because I've yet to change my schemas. Also, smoking actually replaced my old habit of self-harm. Although a poor and not-very-effective replacement, it became my new coping mechanism for the toil of everyday life. I'm pretty sure I'll be able to just force myself to quit smoking, though. But I'll have to find a new, better, and healthier coping mechanism first (which is terribly difficult despite my earnest attempts). 

I was smoker about 5 years. Now i'm 22 years old, and i dont smoke, because in one moment i understood that i'm addicted. I could not  feel good without pack of cigarette, and if my pocket empty i'm started nervous. So need serious reason to quit smoking, i chose sport. It was hard, after work out wanted smoke, appeared short of breath. So it could not last, and i decided to qUit. It need to do at once, without any books or medical help. Most important really want it. It is easy, and by the way it is good economy, for example in Russia cigarette price in middle 2 dollars. Better spend this money on chocolate )

In Russia most high percent of smokers, and especially among young people. Nothing good, you know :)

@Carmelo - I see you don't believe in science. Care for a smoke?