Marijuana use is forbidden by law in Australia but is the most "widely used illicit drug" in the country, just as it is in countries such as the United States and New Zealand. Prohibition of alcohol in the United States, repealed in 1933, is considered a failed "social experiment" because many citizens ignored what it stipulated, turning to home-made spirits in lieu of licensed alcoholic drinks and resultantly making problems worse. In the United States today, tension over marijuana legalization is in response to the current marijuana prohibition in most states, but there are efforts to legalize cannabis in many countries such as the United States and Australia, as its legalization has the potential to greatly increase revenue.