CANNABIS use does not affect teenagers' IQ, according to new research out of the USA.
Researchers from Arizona State University found that taking the drug between the ages of 12 and 18 did not cause adolescents' intelligence to decline.
Yet, children with low IQs were more likely to use cannabis as teenagers, the research added.
The study was conducted by analysing 1,989 twins born in England and Wales between 1994 and 1995.
Researchers said the study busted an age-old myth about cannabis and the harm it caused.
Previous studies have revealed cannabis use affects teenager's educational achievements, as well as increasing their risk of depression and psychosis.
IN OTHER medical news, scientists believe aspirin could reverse the effects of tooth decay.
If true, it could result in a reduction in the need for fillings, scientists have found.
The common pain relief medication can do this by triggering teeth to self-repair, they say.
The cheap drug is able to help form new dentine, the hard tooth structure that is usually damaged by decay, according to researchers at Queen's University Belfast in Northern Ireland.
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