What Are the Long Term Side Effects of Smoking Marijuana?

I know this person. Someone really important to me. "Mr." is 33 years old and has been smoking daily since he was 15. Its a very long time to be smoking marijuana ( my opinion). Its daily morning, sometimes noon and night. I just want to know what the future of his brain holds.He is living a normal life, really don't think hes running from anything. Unsure about his daily thought pattern. Is smoking week that addicting? Is that a side effect too? Addiction. Or is it pure pleasure?

Suggestion:

Memory loss, inability to focus, suicidal thoughts, depression, lung cancer, mouth cancer, throat cancer (its not just cigarette smoke that causes cancer, but smoke in general), reduction/loss of fertility, among others.

Similar to smoking or alcohol, pot abuse can cause serious problems… once in a while (1-2 per month or less) will have low-nil risks associated.

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