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"Constituent means any chemical or chemical compound in a tobacco product that is or potentially is inhaled, ingested, or absorbed into the body, any chemical or chemical compound in an emission (e.g., smoke, aerosol, droplets) from a tobacco product, that either transfers from any component or part of the tobacco product to the emission or that is formed by the product, including through combustion or heating of tobacco, additives, or other components of the tobacco product. "Ingredients refer to the components of parts of a tobacco product made or derived from tobacco, or are burned, aerosolized or ingested during tobacco product use. Additives refer to substances where intended use results or may reasonably be expected to result, directly or indirectly, in its becoming a component or otherwise affecting the characteristic of any tobacco product Constituents refer to chemicals in the tobacco product or its smoke or aerosol."[1: https://www.federalregister.gov/documents/2021/10/05/2021-21011/premarket-tobacco-product-applications-and-recordkeeping-requirements)]

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