I doubt anything will happen to you as long as you keep things discreet.

When I was in Cuba, there were constantly people coming up to me wanting to sell cocaine/lobsters/girls/cigars. It was quite evident that you weren't going to get caught.

Some of them are quite desperate, and they're happy to do business. Interestingly, they told me they really wanted shirts. So basically be happy to swap a shirt for a box of cigars. Also branded clothes like sports jerseys seemed to be something they wanted to barter for.