Why are you telling me about your grandfathers cigarette smoking? I thought we was discussing weed maaan. I never claimed there isn't any negatives to using cannabis, every thing has pros and cons. In moderation cannabis is good for you. I suggest you all need to go watch the movie "super high me" its a documentary of sorts about an avid pot smoker who is a comedian. He goes completely clean for a month and has numerous medical tests done on him while he is clean. Then after the month is up, he goes on a smoking binge of getting high from the moment he wakes up to the moment he goes to sleep. His results of the medical tests and such while he is high are very surprising.