The legalization of recreational marijuana has become widespread in the U.S. since Colorado’s adoption in 2012. Today, 24 states and the District of Columbia have legalized cannabis products.

But none of these jurisdictions require adequate product warnings, calling into question state commitment to informing the public about the health risks of a now widely available drug, as is already done for alcohol and tobacco.

That’s because every state makes its own choice about whether — and what — to include on its cannabis products. One recent study found that there are currently 12 different health warning label regulations incorporated into marijuana products in at least one state. According to new research I conducted for the American Enterprise Institute. Nevada and California require

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