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Your hypothesis here though is full of complicating factors.

For example

>I stopped drinking heavily and using other drugs, i.e. marijuana

Like the primary change you made was to cut out using a whole bunch of drugs with known, significant neurological effects.



I think the "and" is for "stopped (both) A and B"


Yes, that's what they're pointing out. Changing multiple variables at once means you can't attribute changes to any one of those variables in particular.




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