Forbes posted an opinion piece on the taxes spent on busting Marijuana users, much like the article below.

The U.S. marijuana is a $113 billion annual business that costs taxpayers $41.8 billion in enforcement costs and lost tax revenues, according to a study to be published later Monday.

The study, "Lost Taxes and Other Costs of Marijuana Laws," by Jon Gettman, contends that marijuana sales are mostly the province of teenagers and young adults. His numbers also imply that the industry is supported, in both demand prices, by a relatively few extremely heavy users.