Tomo:
Anyone that smokes anything somewhat regularly will suffer from it's effects- you'll have shortness of breath and the smoke does great damage to your lungs. I've also heard that smoking weed is bad for your chi flow because it lodges in your spine and impedes the flow of chi. I'm no scientist, but I don't see how weed can be beneficial to you, especially in the long run. I used to smoke fairly regularly, but I have now stopped completely, and I feel much better. Smoking is a fun experience, but it's not worth it overall to me. Different people have different experiences I guess, but it doesn't work for me anymore.

Knowing others is wisdom, Knowing the self is enlightenment- Lao Tzu