This paper reviews the main toxics which are deleterious to fertility. Toxics are identified through in vitro, animal and clinical studies. The practitioner tries to assess whether a couple consulting for infertility has been exposed to such toxics. Some toxics are voluntarily taken: this is the case for tobacco, alcohol and other, maybe illegal, recreative drugs. Tobacco is the most frequently observed. The assessment of tobacco consumption and the implementation of weaning procedures have been studied in numerous papers: psychological, pharmacological and even immunotherapy-based approaches have been proposed. Alcohol abuse is even more difficult to assess: the border between acceptable convivial and excessive consumption is not clear-cut, except during pregnancy where there should be no alcohol consumption. This also holds for "recreative" drugs. It is usual clinical practice to register the medicine taken; some of these may be toxic for fertility. There is an ongoing work for listing these toxic drugs. Occupational life may also lead to exposure to toxics or be deleterious for fertility by imposing body constraints.
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