Narcotourism (noun) a compound of narco(tic) and tourism.

Narcotourism is the practice of travelling abroad from one's home or resident country with the express intention of procuring and using substances perhaps banned or prohibitively expense where one lives.

Not unlike reverse osmosis, i.e. one travels from a place of a low concenration of drugs to a place of a high concentration.

When you eat dirt for the first time and leave your family to build a shack in the woods