The idea of the best legal THC vape varies greatly according to your local laws and individual preference for cannabinoid type. Hemp-derived products with under 0.3% Delta 9 tetrahydrocannabinol are compliant at a federal level, though state laws are mixed. Always opt for products with clear third-party lab testing, such as that in the THC Vape by Killa Kush, for guaranteed potency and purity.