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"The interaction of tobacco, and especially nicotine, with brain chemistry is a fascinating area that we're just beginning to understand, especially when it comes to correlating neurochemistry with behavior," said study leader Jon-Kar Zubieta, a psychiatrist and neuroscientist at the university

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Other colours were also considered, including lime green, dark grey and mustard

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And more recent studies have found these metals are associated with a plethora of negative health effects, such as popcorn lung - inflammation in the lungs which causes wheezing, coughing and shortness of breath