A contradiction: There seems to be a paradox in your query. It sounds suspiciously like a question one would ask when one is trying to beat a drug test. But how could a heavy user hope to beat a drug test consistently? That would entail NOT being a heavy user pretty often. I guess I don't follow the logic of your question.
Answered 5/21/2016
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A doctor has provided 1 answer
A doctor has provided 1 answer
7 doctors weighed in across 2 answers
8 doctors weighed in across 2 answers
A doctor has provided 1 answer
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