At the very least in britain, where there is a compact, highly controlled, legal medical market, the few carts that are offered incorporate no additives whatsoever - only cannabinoids and terpenes. You can look up Theraceed and Columbia, each of which IIRC are sold within the US Way too. https://www.tvbloggin.com/pcp-break-motion-co2-air-rifles-air-gun-pistols-12-gram-88-gram-co2-cartridges-knives-crossbows/