Varies & maybe: Different drugs are metabolized & eliminated from the body at different rates, so there is no one answer to this part of your question. Mri brain scans can detect brain damage, but not all kinds of brain damage. Also anatomy is not the same as function. So just because a scan looks "bad" doesn't mean the function is bad. If you abuse drugs & brainscan shows damage, it's too late to undo. But quit!
Answered 9/11/2019
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