That's not the problem. Things have been added to increase its potency. Even without these being added, the drug itself has detrimental effects to the human brain. Pure marijuana -blam!-s you up.
It is not safe. Do research.
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1 injection of marijuana gets you addicted for life. Don't do drugs, mmmmk?
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Oh of course. My friend injected one marijewuana and then a few years later he died in a car crash. So sad. But nah seriously don't smoke weed.