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The cigarette companies are now using their long-held expertise gathered over the last hundred years to market and sell their deadly product into overseas markets like China, India, and many developing countries that do not have regulations and prohibitions on smoking like Western countries

The study looks at a single point in time and cannot prove that secondhand smoke exposure causes mental health problems, the study team cautions

Smoking during pregnancy also increases the risk of malformations such as cleft lip and palate, impaired brain and lung development and sudden infant death syndrome (SIDS)

Unsurprisingly, a lack of sleep has similar if not more damaging effects on fitness goals than stress

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