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For medical applications of marijuana it might be possible to somewhat objectively quantify the positive results. However, it is probably not possible to objectively quantify the positive results recreational use (increased creativity, recreation, fellowship, etc.).

It seems to me that the larger issue is the significant negative results of criminalization.

Legal trouble and jail probably causes some disorders to manifest (like extreme anxiety).

...in people who are already disposed to these disorders.

> ...in people who are already disposed to these disorders.

So? If the disorder would have otherwise remained latent in an individual, and marijuana was the environmental factor that caused it to manifest itself, then that's definitely a negative health outcome of marijuana.

We don't have anything close to evidence of a causal relationship.