Researchers from University of California San Diego have found that Delta-8 tetrahydrocannabinol (delta-8 THC), a psychoactive compound often sold as a legal alternative to marijuana, is most commonly used in states where marijuana use remains illegal and delta-8 THC sales are unregulated. The findings, published in the American Journal of Preventive Medicine, highlight how gaps in cannabis policy may be inadvertently steering people toward less-regulated substances and have allowed manufacturers to evade restrictions placed on marijuana products.