One of the most prestigious and rigorous sources of analysis of scientific studies in medicine, the Cochrane Collaboration, considers e-cigarettes to be at least as effective as nicotine replacement therapy (14)
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Results of lab-based studies, including some in animals, suggest that compounds called nitrosamines in e-cigarettes can damage DNA, according to The team reported that lung cells were less able to repair themselves after exposure to e-cigarette smoke
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Smoking increases the risk of reinfection by: Weakening immune defences Encouraging bacterial growth Reducing saliva flow, which normally protects teeth Irritating healing gum tissue This can be especially problematic if the tooth has not yet received its final crown or permanent restoration
Reynolds, R., Project SCUM