I started smoking weed when I was 14, and smoked for a good 8 or 9 years. I know smoking at such a young age probably stunted the growth of my lungs, and with the tar on top of that, my lung capacity isn't the greatest. I never smoked cigarettes, and I quit smoking herb.

What, if anything, can I do to expand my lung capacity? I'm about to start taking Taichi, where breath control is very important.

Thanks for any help