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Symptoms change with use

While the authors said they did not believe e-cigarettes were more harmful than ordinary cigarettes, they suggested that over 20 or 30 years there might be an effect and urged cautious scepticism about the safety of vaping

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Key Points of the Timeline In 8 hours, your levels of carbon monoxide and nicotine reduce by 50% In 24 hours, all carbon monoxide ingested from cigarettes are eliminated from your body In 48 hours, there is no nicotine left in your body

He has been an outspoken critic of the vaping industry and, in particular, e-cigarette giant Juul