Mexican immigrants flooded into the U.S. after the Mexican Revolution of 1910. Once they arrived, the immigrants introduced the U.S. to the recreational use of marijuana. By the 1930s, the public resentment and fear of the Mexicans led to an escalating concern about marijuana, which eventually linked the use of the drug with violence, crime, and inappropriate behavior. By 1931, 29 states prohibited marijuana, but that didn’t stop marijuana users and enthusiasts from inventing ingenious marijuana gadgets and accessories that we still use today. Now, it’s hard to keep up with all the new toys, as producers come up with more ways to smoke discreetly and while multitasking.