Clearly you must be reading an entirely different set of peer-reviewed articles from the ones I&#x27;ve just been looking at.<p>&quot;Persistent cannabis users show neuropsychological decline from childhood to midlife&quot; www.pnas.org&#x2F;cgi&#x2F;doi&#x2F;10.1073&#x2F;pnas.1206820109<p>&quot;Cannabis use has been shown to impair cognitive functions on a number of levels —from basic motor coordination to more complex executive function tasks, such as the ability to plan, organize, solve problems, make decisions, remember, and control emotions and behavior. These deficits differ in severity depending on the quantity, recency, age of onset and duration of marijuana use. &quot;. J Addict Med. 2011 Mar 1; 5(1): 1–8.<p>Plenty more where these come from.