Third-hand smoking and sleep

The home, where individuals spend the majority of their time (leisure time + sleep time), is a place of exposure to smoking. According to INPES, "we spend an average of 14 hours a day at home" or half of our days.

Given that one third of a person's life is spent sleeping, the home is a major site of exposure to third-hand and second-hand smoke. Smokers and all non-smokers in the same household are exposed to higher levels of these pollutants than in a non-smoking household.^[1]. The time of sleep does not correspond to a time of withdrawal from exposure to tobacco: many pollutants (CO₂, PM, VOCs and CH₂O) exceed recommended thresholds during sleep.

The Academy of Medicine points out that tobacco smoke constitutes "the most dangerous source of domestic air pollution, due to its high concentration of toxic products, but also because we are exposed to it at any age and for much longer periods than those during which we are exposed to outdoor air pollution."^[2]The risks associated with passive smoking increase with the duration and intensity of exposure: the more individuals are exposed to tobacco smoke, the more sensitive the effects of this exposure are.