Do health teachers lie about weed?

So, we had a whole lesson about the "Dangers" of Marijuana. My health teacher said, it kills brain cells, makes you pretty stupid, one of the most dangerous drugs, even more dangerous than alchol, tab, cigs. After the class was over i was like "Wow, thats one dangerous drug. So I wanted to know more... show more So, we had a whole lesson about the "Dangers" of Marijuana. My health teacher said, it kills brain cells, makes you pretty stupid, one of the most dangerous drugs, even more dangerous than alchol, tab, cigs. After the class was over i was like "Wow, thats one dangerous drug. So I wanted to know more about weed and i did research. I was supprised that the information I found was kinda the complete opposite of what my health teacher told us. It says that weed DOES NOT kill brain cells, Tab, alchol is FAR more dangerous that MJ. Do health teachers lie on purpose, or just lack of research?
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