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Researchers suggest blood nicotine levels can drop by 50% in As a result, clinicians believe that measuring cotinine levels may be a better measure of tobacco exposure

Cotton Trust Protocol, which promotes eco-friendly practices such as reduced pesticide use and water conservation

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They concluded: Our study strongly suggests that electronic cigarettes are not as safe as their marketing makes them appear to the public. One senior author, Jessica Wang-Rodriguez, a pathologist with the San Diego branch of the US Department of Veteran Affairs, said: Based on the evidence to date I believe they are no better than smoking regular cigarettes. Very few public health chiefs are likely to agree with her