I guess I was worried about that too when I started smoking weed some 30 years ago, I wasn't nearly as concerned about the long term effects as I was about the current effects, or how it would influence my life while I was smoking. So I decided very early on a way to find out. I would allow my self to smoke as much as I wanted, and as often as I wanted for 6 months, then for 6 months I would be completely clean ,a 6 month on 6 month off cycle, I have been very strict and very consistant with this policy and continue to use this method. I have friends that use a 3 month on 3 month off system with good results. I could go on and on about all the benifits from doing this but I think they are pretty obvious, I can tell you for sure that I have been consistantly more creative, more productive and a hell of alot happier during the ON times, So I've continued to use this approach without variation and I know it provides great balance, I'm 4 weeks into flower right now, add in a nice long dry and cure and it should put me right at the start of my 6 month ON period, Hmmm that first smoke is going to be amazing...