lol, he didnt say very much he explained that ur body has time to clean out the thc if u smoke twice a week... cuz weed doesnt kill the cells.. it covers them, but if u smoke everyday or so.. the thc will cover them an eventually will suffocate the cell an kill it.. so if u stop for a few days ur body cleans the cell an the cell lives.. thats just what i was told tho lol so if any one has the 100% truth please do tell