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Is nicotine all bad?

A man participates in a test in the "smoking laboratory" at Bristol University in England May 1, 2015.   REUTERS/Cathal McNaughton

A man participates in a test in the "smoking laboratory" at Bristol University in England May 1, 2015. REUTERS/Cathal McNaughton

A man participates in a test in the "smoking laboratory" at Bristol University in England May 1, 2015. REUTERS/Cathal McNaughton
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Marcus Munafo, a professor of Biological Psychology, poses for a picture in his office at Bristol University in England May 1, 2015.  REUTERS/Cathal McNaughton

Marcus Munafo, a professor of Biological Psychology, poses for a picture in his office at Bristol University in England May 1, 2015. REUTERS/Cathal McNaughton

Marcus Munafo, a professor of Biological Psychology, poses for a picture in his office at Bristol University in England May 1, 2015. REUTERS/Cathal McNaughton
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A man participates in a test in the "smoking laboratory" at Bristol University in England May 1, 2015.   REUTERS/Cathal McNaughton

A man participates in a test in the "smoking laboratory" at Bristol University in England May 1, 2015. REUTERS/Cathal McNaughton

A man participates in a test in the "smoking laboratory" at Bristol University in England May 1, 2015. REUTERS/Cathal McNaughton
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Marcus Munafo, a professor of Biological Psychology, poses for a picture in his office at Bristol University in England May 1, 2015.   REUTERS/Cathal McNaughton

Marcus Munafo, a professor of Biological Psychology, poses for a picture in his office at Bristol University in England May 1, 2015. REUTERS/Cathal McNaughton

Marcus Munafo, a professor of Biological Psychology, poses for a picture in his office at Bristol University in England May 1, 2015. REUTERS/Cathal McNaughton
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