Educate me on weed. Should I vote for legalisation? Does cannabis harm intelligence?

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My country (New Zealand) is about to have a reeferendum in one month about whether or not to legalise marijuana.

I'm thinking about voting yes to legalisation. I've never smoked weed before. But maybe smoking pot is the thing that makes me happy and fix my crippling depression.

Redpill me on marijuana, /sci guys. What are its pros and cons? Does it damage your intelligence or make you psychopathic? Is it highly addictive?