sufficient to bring about an increase in its use. While this is a tempting assumption, it is
a problematic one. The presumption required to substantiate this view is that drug users
are not particular about which drugs they use, so that if marijuana and heroin are not
available, they will switch to whatever drug is available―cocaine in this case. The
assumption does not seem reasonable on its face. Marijuana, heroin, and cocaine are not
alike in their effects on users; nor are they alike in the manner in which they are
ingested or in their addictive properties. The view that drug users choice of drugs is
simply a function of supply overlooks these important differences.
In conclusion, the author has failed to establish a causal link between increased
enforcement efforts and the observed increase in illegal cocaine use. While the
enforcement activities may have been a contributing factor, to show a clear causal
connection the author must examine and rule out various other factors.
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