That sounds like the late 90's to me but of course with such close proximity to the US its way possible especially when you consider hippy travel destinations of the time. Much more likely in Jamaica than lets say Colombia i'd say. I'd love the reference to that book too btw! Sounds super interesting!I was talking about crossing the original line to indica, but also selection of plants for 'indica' type phenos. I read a book by a pot smuggler importing Jamaican weed. He got hold of indica seeds early seventies and got the growers there to mix it with the sativa they were growing.
The growers were thrilled to boost thc and shorten the flowering time with added weight to the buds.