Childhood marijuana use can affect brain function and lower IQ: study

A new study out of Western University and the Robarts Research Institute in London, Ontario, has found that early use of marijuana can detrimentally affect brain functioning and potentially lower IQ.

Researchers were looking into the effects of frequent marijuana use on brain development and mood disorders in youth aged 16 to 23 and found not only that marijuana use did not alleviate depressive symptoms but that it had a deleterious effect on brain functioning in a number of areas related to visuo-spatial processing, memory, self-referential activity and reward processing.