For hardware, the COA should be about more than just CBD content. You're buying a device that touches your mouth and lungs, so you want to know about material safety—heavy metals like lead and cadmium, plasticizers like phthalates, and other contaminants that can leach from cheap materials.

Ask: "Does the COA include testing for heavy metals and plasticizers?" If it only shows a cannabinoid profile, that's not enough. A good COA for hardware will have a full panel of safety tests. This is where a supplier's transparency really shows.