An elephant in the room is bipolarity, with marijuana exacerbating hypomanic episodes.

So from the grandiose and delusional schemes bipolars are prone to, it's Craziness-Plus™,-- like what we're seeing in Ottawa. Add in the "kindling effect" from stress and excitement, and the threshold for triggering episodes becomes progressively lower. Tragically this illness is treatable, but not curable, carrying a high heritability (i.e.  71%), increased by age of the father.

Margaret Trudeau wrote graphically of her experiences in her first book "Beyond Reason" (Paddington Press, 1979), and again in "Changing My Mind" (HarperCollins, 2010). While mentioning her enjoyment of the drug, she was aware it did her no favours.