You really need to stop right now. I started smoking when I was 15 years old. I wrote about it before; it is in the archives somewhere. I also wrote about quitting smoking, and how it was the best thing I have ever done for myself (and my family). I wrote about how hard it was to quit; how I would prefer to have a baby or a root canal without anesthesia than to have to go through that again.
If you are a smoker, young, old or in-between, won't you please stop smoking NOW? Do it before you develop COPD or chronic bronchitis or emphysema. The power is in your hands. Do yourself and your family - especially your children - a BIG favor. Quit while you are ahead, and pray that you have done it soon enough. Please.