(NEWSER) – Smoking dope doesn't actually make you a dope. That's the takeaway from a new study on adolescent twins—one of whom smoked pot over 10 years while the other abstained.

Though a 2012 study linked marijuana use with a decline in IQ, critics say it failed to account for certain factors. Hoping to avoid such complaints, scientists at UCLA and the University of Minnesota reviewed data from 789 pairs of twins. They found marijuana users lost about four IQ points over time, but their twins showed a similar decline, reports Science.

When it came to an apparent decrease in a marijuana user's vocabulary and information ability, the alteration was reduced or "completely eliminated" when researchers adjusted for a participant's reported binge drinking and use of other drugs including tobacco, which may affect cognitive development, per Meta.

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