The Nicotine Content of a Sample of E-cigarette Liquid Manufactured in the United States.

Objectives: Use of electronic cigarettes has dramatically increased in the United States since 2010, with a forecasted growth of 37% between 2014 and 2019. There is little research on e-liquid nicotine concentration from domestic manufacturers. However, limited research outside of the United States found wide inconsistencies between the labeled concentration of nicotine in e-liquids and the actual nicotine concentration.