People who use marijuana recreationally, mostly on weekends for example, are likely to have used or are currently using other drugs.
There are some instances of individuals high have been high on LSD who attempt to walk through traffic while hallucinating; these incidents have resulted in numerous accidental injuries and cases of death.
The U.S. has recently experienced an increase in the number of marijuana plants which have been destroyed, particularly those being grown on public lands by foreign criminal groups.
Serious side effects as a result of methamphetamine use which could be life threatening can include convulsions, dangerously high body temperature, stroke, cardiac arrhythmia, stomach cramps and shaking.