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An anecdote from someone with first hand experience seeing "burn out" happen is neither a theory nor unsubstantiated. An interesting question, however, would be whether there is something that predisposes some people to marijuana use, and whether that predisposition is associated with susceptibility to "burn out," even if marijuana hadn't been involved.

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It's a theory in the colloquial sense of the word, and it is unsubstantiated in the only sense of the word. You are also working under the assumption that marijuana users experience "burn out" and trying to distinguish cause from correlation, but your underlying assumption has no evidence.

What I should have said is that the OP has made an observation, and your argument would be more convincing if you explained why that observation was incorrect, and what is the correct explanation of what he observed.

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