Just imagine how bad that sht is for you! There is literally nothing good about smoking. It's filling your lungs up with tar. It's potentially creating cancerous nodes that could make you die a horrific death. It's very likely going to cause emphysema and other conditions that could make you require oxygen in order to do the basic things in life like walking to the garage.
My friend's dad had smoking problems and near the end could not leave the room without a bottle of O2 (actually, he was bedridden the last bit). This guy was an engineer all his life and had all kinds of things he wanted to do around the house and had to call in my friend's husband and I just to do these simple things. It really made him depressed to have to do that.
I remember right near the end when I came by to help with something, and he asked me to buy him cigs. You could see the desperation in his eyes, and he felt bad for having asked, but I had to say no. I could not face my friend knowing that I bought her dad cigs when he was so bad. Thinking back now I believe I probably should have bought them anyway, since he was obviously so near the end, but I have to tell myself that if nobody else in his family was willing to buy them for him, then I had no business doing it.
Seeing someone in that condition can really make you think about things.