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These findings highlight the importance of considering the broader effects of smoking on male reproductive health beyond testosterone levels

Despite the results, Kang was careful to not make any firm conclusions, given the lack of causal evidence

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These include toxic metals, poisonous gases and chemicals that cause cancer

It may seem now that e-cigs are an improvement on normal ones but time and history have a nasty habit of proving things not to be as they first appear

Wing said a similar difference wasn't found in the oldest group in the study, which may indicate that quitting earlier affords people greater benefits