The number of patients admitted with psychotic episodes after having consumed cannabis has more than tripled in Germany over the last 15 years, from 3,392 in 2000 to 11,708 in 2013. More than half of the patients are younger than 25.
Links
[1] http://www.worldcrunch.com/culture-society/teen-marijuana-use-and-the-risks-of-psychosis/drug-health-addiction-cannabis-europe/c3s18633/#.VZ_btPlVhBc
[2] http://www.rethinkpot.org/tags/psychosis
[3] http://www.rethinkpot.org/tags/germany