If you guessed F, then sadly, you are quite correct.

According to the new , of adults who are aware of electronic cigarettes, about half (49.3%) believe that cigarettes are no more harmful than e-cigarettes, which contain no tobacco, involve no combustion, and have been shown to have much lower levels of carcinogens and other toxins.

2. Propylene glycol and/or glycerin

There is a provision for of informed consent; however, the conditions for such a waiver were not met because: (1) the level of risk was not minimal; (2) the waiver did affect the rights and welfare of the subjects; (3) the research could still practicably have been carried out with informed consent; (4) subjects were not provided with information after the study to explain what occurred.

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