I know many people, who are in the 50 - 60 range who smoke weed and they have zero health issues, are very successful, and have families. So to respond to that comment, yes, he does have an idea what it will do in 20 - 30 years.
I did a little research:
Long term effects of marijuana use are similar to those of cigarettes, maybe moreso because of the lack of filters, maybe a little less so because of the lack of industrial carcinogens.
Research shows it acts as a t-cell supressor, which reduces immune-system response.
Introducing THC into the brain over the long term causes a reduction in dopamine production, which increases stress response.
Maybe it's not all that bad for you, but I notice that drug users always feel a need to defend themselves and deny that it's in ANY WAY bad for them.
Granted, EVERYTHING is probably bad for you in one way or another, but be realistic.
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