The University of Washington Alcohol and Drug Abuse Institute has a factsheet that reviews the relationship between marijuana and aggression.  According to the factsheet, marijuana is less likely than most other drugs to cause violent behavior, although some people who use marijuana can become violent.  Marijuana can cause aggressive behavior because intoxication on marijuana can cause fear, paranoia, anxiety, and panic.  The article describes why marijuana users can become aggressive, and how to respond to threatening or violent behavior.  To read this article in its entirety, click here.