e-cigarette

• An electronic cigarette is an electrical device that simulates the act of tobacco smoking by producing an inhaled vapor bearing the physical sensation, appearance, and often the flavor of inhaled tobacco smoke, without its odor or, ostensibly, its health risks.
• It endeavors to deliver the experience of smoking without the adverse health effects usually associated with tobacco smoke, or to at least greatly reduce those risks.
• The device uses heat (or in some cases, ultrasonics) to vaporize a propylene glycol- or glycerin-based liquid solution into an aerosol mist, similar to the way a nebulizer or humidifier vaporizes solutions for inhalation.