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Tiffany Kary, Bloomberg.

A little-known substance derived from hemp is flying off the shelves of U.S. gas stations and smoke shops, offering users a cheap and convenient high even in states where marijuana isn’t legal. But large cannabis producers are now pushing to clamp down on Delta-8 THC amid worries that a lack of oversight means heavy metals and unexpected intoxicants are cropping up in some of the products.

The cannabis compound has proliferated in gummies, joints and vape pens, with sales more than doubling in the past year across the country. Despite being almost chemically identical to federally outlawed forms of marijuana, Delta-8 has escaped widespread scrutiny thanks to ambiguity in U.S. laws.

People are taking CBD and doing chemical reactions and turning it into Delta-8 THC and selling that at gas stations and marketing it to kids. There are people walking up and buying it who think it won’t get them high.

Josh Wurzer, Co-Founder and President, SC Labs

That’s starting to change, with a coalition of cannabis producers now pushing federal and state regulators to block sales of unregulated Delta-8. More than a dozen states have already moved to restrict the products.

The previously unreported effort by industry leaders to rein in the booming but unchecked sector comes as chemists and health advocates sound alarms over…