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Electronic cigarettes, more commonly known as vape products and e-cigarettes, operate by heating a nicotine-containing liquid formulation (commonly referred to as an e-liquid) to generate an inhaleable aerosol that is delivered to the user’s lungs. Shelf-life studies are critical for assessing how electronic cigarettes respond to intrinsic and extrinsic factors and are crucial in ensuring product quality. Here, Paul Barr, Principal Scientist at Broughton, explains the value of shelf-life studies in the production of e-cigarettes.