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However, after completing a series of physical tests, their testosterone levels normalized to their usual values

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The study, to be published in the Journal of Addiction, concluded: 'The sooner smokers get off this escalator of death the longer and healthier they can expect their lives to be.' Dr Sarah Jackson, principal research fellow from the UCL Alcohol and Tobacco Research Group, added: 'It is vital that people understand just how harmful smoking is and how quitting can improve their health and life expectancy

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Similar content being viewed by others Log in or create a free account to read this content Gain free access to this article, as well as selected content from this journal and more on nature.com or References Barrett SP, Boileau I, Okker J, Pihl RO, Dagher A (2004)

It will also alter the flavor of the smoke, which is objectionable to some