When the young woman was preparing to open a business in Jamaica selling pipes, vaporizers and other smoking paraphernalia, some acquaintances suggested she would have difficulty succeeding in a niche trade dominated by men.

Now, about a year-and-a-half after its launch at a hotel complex in Jamaica’s capital, Ravn Rae’s smoking supplies store is growing and she’s proving doubters wrong in a Caribbean country where women have made such big advances in professions once dominated by men that a new U.N. study says it has the world’s highest proportion of female bosses.