The mere act of consuming illegal narcotics, usually does not cause one to commits crimes. While drugs affect the mind, a large increase in drug consumption by itself will not cause a large increase in the number of crimes committed.

Note that criminal activity is often related to drug use due to its present illegal nature and the fact drug users steal in order to acquire drugs. (or other drug related crimes.) However, this is not a direct result of the bio-psychological effects of the drugs themselves.