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Teens Who Smoke Pot: At Risk For Mental Illness Later?

Teenagers and young adults who use marijuana may be messing with their heads in ways they don’t intend.

Evidence is mounting that regular marijuana use increases the chance that a teenager will develop psychosis, a pattern of unusual thoughts or perceptions, such as believing the television is transmitting secret messages. It also increases the risk of developing schizophrenia, a disabling brain disorder that not only causes psychosis, but also problems concentrating and loss of emotional expression.

In one recent study that followed nearly 2,000 teenagers as they became young adults, young people who smoked marijuana at least five times were twice as likely to have developed psychosis over the next 10 years as those who didn’t smoke pot.

Another new paper concluded that early marijuana use could actually hasten the onset of psychosis by three years. Those most at risk are youths who already have a mother, father, or sibling with schizophrenia or some other psychotic disorder.

Young people with a parent or sibling affected by psychosis have a roughly one in 10 chance of developing the condition themselves — even if they never smoke pot. Regular marijuana use, however, doubles their risk — to a one in five chance of becoming psychotic.

In comparison, youths in families unaffected by psychosis have a seven in 1,000 chance of developing it. If they smoke pot regularly, the risk doubles to 14 in 1,000. Read more »

*This blog post was originally published at Harvard Health Blog*

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