premise: The recreational pleasures that ordinary islanders enjoy have become synonymous with the name  dancing to the heavily rhythmic musical beat; taking a little marijuana (or  ganja,  as it's known here), which many Jamaicans view as a kind of medicinal herb; or simply sitting back and chatting with friends on a bench or street corner, where the situation is described as  Irie  the equivalent of  Everything's just fine!  
hypothesis: Marijuana is known as ganja in Jamaica.