Some people who smoke marijuana report having sudden feelings of anxiety and paranoid thoughts. These responses are more likely to occur with use of higher potency marijuana, according to the National Institute on Drug Abuse.
Research also shows that regular use of marijuana is linked to an increased risk of depression, anxiety and a loss of motivation or drive - when users lose interest in activities that they previously enjoyed.
The effects of smoking marijuana can be unpredictable, especially when it is mixed with other drugs, research shows.
Unpredictable ReactionsThe NIDA reports that marijuana can affect each person differently according to:
- Biology (his or her genes)
- Marijuana's strength or potency (how much THC it has)
- Previous experience with the drug
- How it's taken (smoked versus ingested)
- Whether alcohol or other drugs are involved
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National Institute on Drug Abuse. "Marijuana." DrugFacts Updated January 2014
National Institute on Drug Abuse. "Want to Know More?- Some FAQs about Marijuana." Marijuana: Facts for Teens Updated October 2013
National Institute on Drug Abuse. "Marijuana." Research Report Series Updated July 2012
The Partnership at DrugFree.org. "Marijuana." Drug Guide. Accessed April 2014.