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The machines work by essentially puffing a cigarette and capturing the smoke onto a filter, which can be analyzed to determine levels of various toxins in the smoke

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Acute irritations are common, with everything from staring at your phone to low humidity potentially triggering symptoms, says Whitney Hauser, MD, an optometrist in California

Many drug addicts will display behavior that seems markedly out of character for them, such as skipping work or school or suffering in performance

The producers, speaking individually, described McCartney as a torrent of creativity in the studio, and as an equable collaborator, if a little distant and occasionally defensive