The device uses a liquid to produce the fog. The liquid consists of pharmaceutical grade Propylene Glycol, flavorings, and nicotine. Nicotine amounts are typically available in ranges of 0-36 mg. A small amount of users will experience an allergic reaction to PG and should discontinue use if symptoms appear. Care should be taken to keep the liquid out of reach of children and/or pets as nicotine is a poison.
The E-cig comes in various models and colors, most of which are similar to the size of actual cigarettes and cigars.
Although E-Cig and E-Cigarette are most commonly used, they are not the best terms to describe the device. A more appropriate term would be "personal vaporizer" or "personal inhaler".