Marijuana
The good, bad and unknown about marijuana’s health effects
The good, bad and unknown about marijuana’s health effects
By MALCOLM RITTER AP Science Writer

Turning to potential harms, the committee concluded:

— Strong evidence links marijuana use to the risk of developing schizophrenia and other causes of psychosis, with the highest risk among the most frequent users.

— Some evidence suggests a small increased risk for developing depressive disorders, but there’s no evidence either way on whether it affects the course or symptoms of such disorders, or the risk of developing post-traumatic stress disorder.

— There’s strong evidence that using marijuana increases the risk of a traffic accident, but no clear indication that it promotes workplace accidents or injuries, or death from a marijuana overdose.

— There’s only weak evidence for the idea that it hurts school achievement, raises unemployment rates or harms social functioning.

— For pregnant women who smoke pot, there’s strong evidence of reduced birthweight but only weak evidence of any effect on pregnancy complications for the mother, or an infant’s need for admission to intensive care. There’s not enough evidence to show whether it affects the child later, like sudden infant death syndrome or substance use.

— Some evidence suggests there’s no link to lung cancer in marijuana smokers. But there’s no evidence, or insufficient evidence, to support or rebut any link to developing cancers of the prostate, cervix, bladder, or esophagus.

— Substantial evidence links pot smoking to worse respiratory symptoms and more frequent episodes of chronic bronchitis.

— There’s weak evidence that suggests smoking marijuana can trigger a heart attack, especially for people at high risk of heart disease. But there’s no evidence either way on whether chronic use affects a person’s risk of a heart attack.

— Some evidence suggests a link between using marijuana and developing a dependence on or abuse of other substances, including alcohol, tobacco and illicit drugs
http://www.postandcourier.com/ap/the-good-bad-and-unknown-about-marijuana-s-health-effects/article_91009d04-1bec-5104-8940-ad7c2fbfc898.html

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