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Leukotriene b4 receptor 1 expression on dendritic cells is required for the development of th2 responses and allergen-induced airway hyperresponsiveness

This is due to very low oxygen levels and high carbon dioxide levels within the cigarette's combustion zone, along with the short residence time of airborne vapors and flame quenching effects

Accessed September 17, 2014

i'll never try for that reason, but definitely for this

Unlike cigarettes, where much of the nicotine is lost, vaping can be a more efficient nicotine delivery system in terms of the proportion of nicotine in the e-liquid that can potentially be absorbed