From the article:
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They believe marijuana has too many negatives to be a truly effective drug, with side effects that include memory problems, decreased immunity and possible addiction.
Marijuana has another drawback. From a scientific standpoint, Giuffrida says, it’s "a very dirty drug".
When scientists mix a number of drugs together for a specific purpose it is a "drug cocktail" and is right out there on the cutting edge.
When God does the same, it is a "dirty drug".