I agree and while I have no reason to doubt the science regarding measurement, this quote is telling: "“It is possible that these people already have a differen

I agree and while I have no reason to doubt the science regarding measurement, this quote is telling: "“It is possible that these people already have a different brain and they are more likely to use cannabis.” That point is, AFAIK, the current state of science in addiction related research. Cannabis is not addictive, unless you have a predisposition for addiction. That predisposition correlates with a higher chance of psychosis and such. I totally have no sources other than being Dutch and having seen a documentary. Will search for sources. See sources below (sorry for the Dutch links). I am amazed that you can publish research "because MRI", with a disclaimer that stands at 180 degrees with current information from public health policies. The only point that I see being made taking this into account is: "56 people that smoke daily and got a psychosis, differ from 43 people that don't smoke and didn't get a psychosis, MRIs show." (small lol) Sources (update): [1] THC-monitor in Dutch (20%!! THC avg. in Netherlands in '04, somewhat lower since) [2] Belgian drug information site states my point too: "Use of cannabis can amplify development of psychological trauma in people that have a natural disposition" (my translation) [1] https://www.trimbos.nl/actueel/nieuws/bericht/?bericht=1586 https://www.trimbos.nl/actueel/nieuws/bericht/?bericht=1586 [2] http://www.druglijn.be/drugs-abc/cannabis/faq-is-er-een-verband-tussen-cannabis-en-psychose.aspx http://www.druglijn.be/drugs-abc/cannabis/faq-is-er-een-verb...