Teenagers who regularly use cannabis may suffer a decline in their IQs over time, new research has established. The results showed declines of approximately two IQ points over time in those who use cannabis frequently compared to those who did not. Further analysis suggested this decline to be primarily related to a reduction in verbal IQ. Participants were then monitored until the age of 18 on average although one study followed young people until age 38. The research, published in the Psychological Medicine journal, was funded by a YouLead collaborative doctoral award from the Health Research Board (Ireland) and a European Research Council Consolidator Award.

Source: The Irish Times January 28, 2021 20:43 UTC