cific nitrosamines (TSNAs) were found in many of the cartridges. Inconsistent nicotine amounts were also discovered.

NYU Langone professor Jonathan Whiteson, medical director of the Culinary and Pulmonary Wellness and Rehabilitation Program, has said that e-cigarettes are harmful to users' health.

"Dangerous chemicals have been identified in the vapor, not just nicotine, and they can potentially cause lung damage," Whiteson said. The professor also argues that there is no proof that these devices can be used as a method for quitting smoking, since they are still full of highly addictive nicotine.

E-cigarettes may or may not be a preferred method of reducing reliance on unhealthy cigarettes. Before purchasing them, it is best to read all reviews and safety information to determine a brand that is best for you.