Canada is about to become the second nation to fully legalise recreational cannabis. When prohibition comes to an end on 17 October, Canadian adults will be able to purchase and consume the drug from federally licensed producers. The country has one of the highest rates of cannabis use in the world, particularly among young people. Canadians spent an estimated C$5.7bn ($4.6bn; £3.5bn) in 2017 alone on combined medical and recreational use - about $1,200 per user. The bulk of that spending was on black market marijuana. The bulk of that spending was on black market marijuana. Here's a look at some of the consequences of this sweeping transition in Canada - and the potential winners and losers. (See also: Canadian cannabis will be legal on Wednesday. Read this first)