I haven't been to the doctor in about fifteen years, and I've been smoking pot for about the past six..I only seem to get sick about once a year, after that my body's immune system seems to fight off any other bug that's around..I think it depends upon the individual...

In any case, I do believe that anti-biotics weaken one's immune system by doing your immune system's work for you..

I believe cannabis to actually help my immune system, but as I said, everyone's different..