Among the various “concerns” expressed by those who oppose electronic cigarettes (e-cigarettes), a fear of toxic substances in the vapor emitted by the devices, or exhaled by users (“vapers” as they are known, as opposed to “smokers”) has been raised as an issue. Those who worry about this vapor believe that such emissions would be analogous to second-hand smoke from cigarettes, which has been shown to be toxic, to some extent. Continue reading “An old but still interesting study”