Minnesota and other state’s legislatures across the country are legalizing medical marijuana, but the nation’s physicians aren’t requesting these laws. The American Academy of Pediatrics and the American Society of Addiction Medicine both are against medical marijuana laws. The American Medical Association doesn’t support them either.

Groups representing patients aren’t behind these laws. The American Cancer Society hasn’t demanded them, and the Glaucoma Foundation even warns patients against using the drug.

Instead, the demand comes from groups such as the Drug Policy Alliance and Marijuana Policy Project. These are not medical organizations. They are part of a pro-legalization lobby supported by pro-marijuana billionaires. And they’ve apparently convinced state legislators to ignore some very serious problems.

The biggest problem is that medical marijuana laws are responsible for most of the growth in adolescent use. According to the University of Michigan’s Monitoring the Future survey, teen use in the United States surged...