There is a sure-fire way to cut down on the number of kids smoking marijuana. Regulate it like tobacco. It's way past time to bring our draconian, out-dated laws against pot into the 21st Century. But don't hold your breath waiting for anyone in the federal government to have the stones to even bring it up.

So what accounts for the drop in tobacco use? The regulation of cigarette sales and marketing. As part of the Master Settlement Agreement with 46 states, cigarette companies agreed to stop outdoor advertising and to banish kid-friendly characters such as Joe Camel. Even more important, we as a nation got serious about reducing tobacco sales to kids.

In 1992, Congress passed the Synar Amendment, requiring states to enact and enforce laws prohibiting sale of tobacco products to youth under the age of 18, and setting up unannounced inspections of retail outlets. The program has worked spectacularly well. In 1997, inspectors found that over 40 percent of retailers were violating the ban on cigarette sales to kids. By 2006, the violation rate had dropped to just 10.9 percent, and it's still dropping.

So what does this have to do with marijuana?

Simply put, we have leverage over tobacco sellers that we don't have with marijuana dealers. Because tobacco retailers and producers are licensed and regulated, we have some control over them. If they want to keep their lucrative businesses, cigarette merchants have a strong incentive to follow the laws -- even laws they don't like.