It may be killing you. That's the negative way of putting it. You have authority and dominion over your life. You have the power, the right and, yes, the obligation to do only those things you know to be uplifting and life-enhancing. You are stronger than anything that gets in the way of your achieving this goal.
Every smoker knows the multiple health dangers associated with smoking.
To continue smoking, then, is an ongoing affirmation of illness. I'm not able to control my hands, much less myself. By the very action of lighting up, smokers admit tobacco is a more powerful influence on their lives than they themselves are. This admission may do more harm than the physiological effects of the smoke. Stopping smoking is easy.