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Some people who come into contact with cigarette smoke may experience a number of common symptoms, including: coughing sneezing watery eyes While these allergy-like symptoms can be caused by tobacco smoke, this is not a result of an allergy to the smoke itself

The participants completed a questionnaire about their smoking habits in 2004-2005

Nicotine, the addictive substance found in cigarettes, releases dopamine in the brain, which can create feelings of relaxation and pleasure

Heavy Metals Heavy metals are naturally existing metals having elemental densities larger than 5 gcm 3 and atomic numbers more than 20 [218]