It really depends on what part of the island you're on... And don't listen to Ole Country Boy 'cause that's all he is...an ol' country boy. Jamaica is a beautiful island and its people are some of the friendliest you'll come across. Unfortunately, a majority of the population is impoverished and resort to drugs and violence out of frustration and necessity since the government isn't the best, to say the least. The 'drug heads' Ole Country Boy' might be referring to are possibly Rastafarians, who smoke marijuana as a means to take them to a higher spiritual level and allow them to connect with God.
I know PLENTY of Jamaicans who are not at all involved in any sort of drug use and actually shun it. There are many generalizations about the country, but they hold true only a small portion of the time. My husband, in fact, is Jamaican.
My advice to you: Go to Jamaica for sure. Just keep your head on and use common sense while you're there. Umm, sorry I couldn't answer your question...
If you go to Negril, check out Risky Business. They have great live music and cheap Red Stripe beer and Appleton rum.