Many school districts in the United States have begun to test for abuse of illicit drugs, including steroids, and studies are currently underway to determine whether such testing reduces drug abuse.
Repeated and chronic heroin users who fail to use sterile needles or share equipment may experience infection of the heart lining and valves, normally due to lack of sterile technique.
Some methamphetamine users will experience a mental depression associated with withdrawal that lasts longer than the acute symptoms and is more severe than that of cocaine withdrawal.
It is hard to determine the extent of magic mushrooms use in the United States because data sources tend to exclude magic mushrooms.