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• Electronic cigarettes generate a mixture of vapors and aerosols <br />• A vapor is a gas formed by boiling or evaporating a liquid <br />• An aerosol is a solid or liquid particle suspended in a gas, usually air <br />• Aerosols are measured in micrometers (or microns) <br />• A human hair is 50 to 100 micrometers (µm) thick <br />• Note that "aerosol" and "particle" are synonyms, both terms will be <br />used inter - changeably <br />