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Previous attempts at exploring this relationship have tested for the harmful qualities of BaP on mice

According to the USPS: Hemp and hemp-based products, including cannabidiol (CBD) with the tetrahydrocannabinol (THC) concentration of such hemp (or its derivatives) not exceeding a 0.3 percent limit are permitted to be mailed in domestic mail only when: The mailer complies with all applicable federal, state, and local laws, and plans approved by the USDA under 7 CFR Part 990 pertaining to hemp production, processing, distribution, and sales

[1] Aromatic amines: 4-aminobiphenyl, a group 1 carcinogen, was marginally higher in herbal cigarettes than in regular cigarettes and 1-aminonaphthalene, 2-aminonaphthalene, and 3-aminobiphenyl was lower in herbal cigarettes than in regular cigarettes