No, this isn’t a joke like the one about two pharmacists walking into a bar. It’s a question for which researchers have devised a new theory: they did it to get high. Vivid cave drawings were discovered in Spain and France, but to reach the areas where they were found, people would have had to crawl through extremely narrow passageways. Doing so would have deprived them of oxygen, inducing hypoxia but increasing dopamine in the brain, which can result in hallucinations. Apparently they liked the result because they kept coming back. So … did cave-dwellers invent the natural high?
NCPA
