I have to agree with what everyone hear has said. Although I haven't been to JA since the early 90's I distinctly remember pondering the very same idea and feeling all kinds of relief that I DID NOT bring anything back with me. On the JA side we went through customs that included german shepards and police with automatic weapons, likely for intimidation factor but wtf?! Plus by the time I was ready to leave Jamaica I had smoked my fill of killer weed, hash and ingested enough magic mushrooms to satiate my appetite for some time. Enjoy the island and focus on finding the connect for the best herb you can while your there, not all ganja for sale to tourists is very good.
Enjoy your trip!
Enjoy your trip!