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While e-cigarettes do contain some chemicals, the NHS states that vaping is around 95% less harmful than smoking traditional cigarettes

However, when this exposure was followed by a bacterial or viral infection the e-cigarette exposure inhibited the ability of mice to clear the bacteria from their lungs, and the viral infection led to increased weight loss and death indicative of an impaired immune response.

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There are specific details about devices that vary, so always read up on your individual device as much as possible

Figure 2: Recurrent aphthous stomatitis Source: Science Photo Library Aetiology and presentation A range of aetiological factors have been implicated in RAS, including haematinic deficiency, hypersensitivity reactions and psychological stress [5], [6]