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Second-hand smoke from electronic cigarettes may be less harmful than their tobacco-laden cousins, but they still release toxins into the air, according to a new study

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Baker (1984) proposed that the rate of diffusion of oxygen through the paper has a direct influence on the cigarette smoulder rate, S (mg s 1 ): where D is the diffusion coefficient of oxygen in air through the cigarette paper (cm 2 s 1 ), a is a constant related to the transfer of oxygen to the burning zone, and b is a constant related to the area of paper through which diffusion can occur