As i light a cigarette, I can't help thinking why I smoke?

As i light a cigarette, I can't help thinking why I smoke? It doesn't do me any good. It burns my lips, hurts my eyes, and as I inhale it's dark smoke, it brings pain to my chest and take me to a state where loneliness and emptiness reside. As i throw it's butt, I promised that I would never light another stick again.. Yet it's scent haunts... What the hell. I took out another stick and realized I'm already hooked. It's just like love... harmful... yet, addictive...