How smoking marijuana can affect your intelligence: Using the drug once a week for six months can knock off two IQ points and could have 'significant effects' on teens' verbal skills

Teens who smoke weed at least once a week for six months can lose up to two IQ points as they get older and find it harder to problem solve, a new study revealed. The Royal College of Surgeons in Ireland (RCSI) studied 808 teens who used cannabis at least weekly for at least six months and 5,308 who did not use the drug. They discovered that regular pot smokers suffer a decline of two IQ points over time compared to those who did not use cannabis during their teen years.

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