Is delta-8 THC safe, and how does it differ from delta-9 THC?

Delta-8 THC is a structural isomer of delta-9 THC (the primary psychoactive cannabinoid) with the double bond on the 8th carbon chain rather than the 9th. It occurs naturally in cannabis at very low concentrations (<1%) but is commercially produced by isomerizing CBD — a chemical conversion process. Pharmacology: delta-8 THC is a CB1 partial agonist with approximately 50–75% the potency of delta-9 THC. Users report milder psychoactive effects with less anxiety and paranoia. Safety concerns: (1) The isomerization process uses harsh chemicals (acids, solvents) that may leave toxic residues in the final product. (2) The 2021–2023 surge in delta-8 products occurred in a regulatory vacuum — most products are unregulated and untested. (3) The FDA received 104 adverse event reports from delta-8 products in 2021–2022, including hospitalizations. (4) Some products labeled as delta-8 contain delta-9 THC or other synthetic cannabinoids. (5) No clinical trials exist. The legal status is ambiguous — derived from hemp CBD, it may be federally legal under the 2018 Farm Bill, but many states have banned it.