Prohibitionists have touted time after time “Cannabis lowers your IQ” and their go to study is the one that was conducted in New Zealand. However, a new study covered in Scientific American threw a proverbial spanner in the spokes and challenged the narrative that IQ is affected by cannabis use. Essentially – what the article talks about is the different type of testing researchers do to figure out things like exposure to a drug and the physiological affects over time.