Nat Geo seems to have gathered that info from Ras Malekot, a Rastafarian poet and reggae singer and/or the United Cannabis Ministry run by Reverend Steve Cherms.
According to a statistical based website, which was Nominated for Forbes Most Promising Companies List, StatisticBrain.com, Jamaica ranks 20 in Cannabis usage at 9.9%. The US ranks 12 and Canada ranks 13...
http://www.statisticbrain.com/cannabis-use-by-country/





