“…Many youths also use cigars to make marijuana blunts (i.e., cigarillos with the tobacco removed and replaced with marijuana) ( 4 ), and some use manufactured disposable cannabis products (e.g., vape pens, vaporizer cartridges, oils, and concentrates) ( 5 ). Waste from e-cigarette products can contain plastics, nicotine, heavy metals, other chemical toxins, and hazardous lithium-ion batteries ( 6 , 7 ). The toxicity of combustible tobacco product waste from cigarettes (e.g., plastic cellulose acetate, nicotine, formaldehyde, lead, and cadmium) is well established ( 8 ).…”