Come again?: The nervous system is large, goes everywhere in your body, and is of mind-mangling complexity. The notion of chemicals "infiltrating" your nervous system is simply meaningless. It makes no more sense than to say that gasoline "infiltrates" your car. I don't want to assume too much, but if this is about how to beat a drug test, a doctor can't ethically help you with that.
Answered 5/21/2016
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