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Figure 1 - The emerging phenomenon of electronic cigarettes

Figure 1. Structure of the electronic cigarette. The electronic cigarette is a battery-powered electronic nicotine-delivery device resembling a cigarette designed for the purpose of providing inhaled doses of nicotine by way of a vaporized solution to the respiratory system. This device provides a flavor and physical sensation similar to that of inhaled tobacco smoke, while no smoke or combustion is actually involved in its operation. It is composed of the following key components: the inhaler, also known as the 'cartridge' (a disposable plastic mouthpiece, resembling a tobacco cigarette's filter, containing an absorbent material saturated with a liquid solution of propylene glycol and vegetable glycerin in which nicotine may be dissolved); the atomizing device (the heating element that vaporizes the liquid in the mouthpiece and generates the mist with each puff); and the battery component (the body of the device-resembling a tobacco cigarette-which houses a lithium-ion rechargeable battery to power the atomizer). The body of the device also houses an electronic airflow sensor to automatically activate the heating element upon inhalation and to light up a red LED indicator to signal activation of the device with each puff. The LED indicator also signals low battery charge.
Structure of the electronic cigarette. The electronic cigarette is a battery-powered electronic nicotine-delivery device resembling a cigarette designed for the purpose of providing inhaled doses of nicotine by way of a vaporized solution to the respiratory system. This device provides a flavor and physical sensation similar to that of inhaled tobacco smoke, while no smoke or combustion is actually involved in its operation. It is composed of the following key components: the inhaler, also known as the 'cartridge' (a disposable plastic mouthpiece, resembling a tobacco cigarette's filter, containing an absorbent material saturated with a liquid solution of propylene glycol and vegetable glycerin in which nicotine may be dissolved); the atomizing device (the heating element that vaporizes the liquid in the mouthpiece and generates the mist with each puff); and the battery component (the body of the device-resembling a tobacco cigarette-which houses a lithium-ion rechargeable battery to power the atomizer). The body of the device also houses an electronic airflow sensor to automatically activate the heating element upon inhalation and to light up a red LED indicator to signal activation of the device with each puff. The LED indicator also signals low battery charge.
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