According to the National Institute on Drug Abuse, people are considered addicted to marijuana if they continue to use even when it interferes with many aspects of their lives and if they have withdrawal symptoms when they try to quit.
The NIDA estimates that 9% of all marijuana users end up becoming dependent upon it. If the person began using marijuana in their teens, the percentage of those who become dependent goes to about 17%. For those who smoke marijuana daily, the number who become dependent ranges from 25% to 50%.
Additionally, a study of identical twins found that if one twin used marijuana before age 17 that twin was more likely to use other drugs and develop substance abuse problems later on, compared with their twin who did not start smoking pot early.
NIDA surveys also show that:
- In 2010, of the 7.1 million Americans abusing drugs, 4.5 million used marijuana.
- In 2009, approximately 18% of those seeking treatment for drug abuse reported marijuana as their primary drug.
- Also in 2009, 61% of persons receiving treatment under age 15 reported marijuana as their primary drug of abuse.
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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.