From an article in The Guardian:
Trocchi was still a writer when he fled New York, after being charged with the capital offence of supplying heroin to a minor. He made for Canada by bus, and was met in Montreal by the young, then-unknown Leonard Cohen. After almost killing Cohen with an accidental overdose of opium (he invited the young poet to lick the bowl after his fix) he took a tramp steamer to Aberdeen, and made his way to London, where he became a registered addict on the NHS.
And there's this other weird Canadian connection. Again, from The Guardian:
He was an astute book dealer, with stalls in Portobello, Kensington, and Kings Roa