1. The use of electronic cigarettes has increased dramatically, ever since the fourth quarter of 2011.

"They still have nicotine in them."

3. "With regard to the seven PAH classified as probable carcinogens by the IARC, the concentrations increased on average by 20% from 122.8 ng/m3 (control) to 147.3 + 26.2 ng/m3."

It is beneficial to make sure the nicotine liquid you buy is made of quality ingredients and under strictly controlled conditions. If you buy the cheapest e-liquid, you will get the cheapest e-liquid. Most reputable nicotine liquid suppliers will explain what is in their nicotine liquid and what conditions their e-juice is mixed under.

It is easy to see why this methodology is inappropriate to assess smoking cessation rates among smokers who use e-cigarettes in an attempt to quit smoking.

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