Like CBD, delta-8 (delta-8 tetrahydrocannabinol) is just one of more than 100 chemical compounds found in the cannabis sativa plant [4]. Most people are familiar with THC (delta-9 tetrahydrocannabinol), the main psychoactive compound in cannabis that gives you a euphoric high.
The 2018 Farm Bill [5] legalized the production and sale of CBD products (which don’t get you high) on the federal level in the U.S. as long as they contain less than .3% of THC. In theory, this would allow federal legalization of CBD products with delta-8 under those same guidelines, but doctors, like internal medicine specialist Paul Terpeluk, DO, are expressing concerns about delta-8 products because delta-8 is psychoactive and produces same or similar highs as THC.
Links
[1] https://health.clevelandclinic.org/what-is-delta-8/?
[2] http://rethinkpot.org/tags/delta-8
[3] http://rethinkpot.org/tags/study-0
[4] https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4740396/
[5] https://crsreports.congress.gov/product/pdf/R/R45525