Researchers have said using cannabis can affect memory, concentration, and decision-making.
The Canadian experts reviewed the scientific evidence surrounding the drug, and warned the effects of cannabis or marijuana can persist well beyond the period of intoxication.
University of Montreal scientists claimed children who smoke the drug may perform worse at school because of its effects. And adults who use the drug, considered a class B substance in Britain, could also suffer at work or impair their driving ability.
The review, published in the journal Addiction, concluded the impairments ‘may be worse in regular and heavy users’.
More prevention measures are needed in schools to prevent adolescents using the drug chronically, researchers said.
Montreal academics analyzed existing cannabis studies involving more than 43,000 people.
The study looked at how the drug affected memory, learning, attention, processing speed, language, and motor function.