Commentary on Wagener etal. (2012): E-cigarettes: Room for cautious optimism

Wagener and colleagues examine concerns that have been raised about e‐cigarettes, and argue that these have been overstated relative to the potential benefits of these new products. Their paper raises important questions about the possible role of e‐cigarettes in tobacco control, and in particular in tobacco harm reduction. What place might e‐cigarettes have in efforts to reduce the harm from smoking and what further evidence is required before policy‐makers and regulators can reach informed conclusions about their safety and efficacy?