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However, other studies showed that SES was unassociated 15,16,17 , or even positively associated with adolescent EC use or use susceptibility 18,19

The common presentation includes: shortness of breath, labored breathing, persistent cough with mucus (sputum), wheezing, cyanosis (bluish discoloration), chest tightness, unintended weight loss, frequent respiratory infections and lack of energy or ever tiredness

Experts do not yet know the exact cause of atopic dermatitis

Finally, no significant association has been found between smoking and any potential changes in cohabitation status, and there were only slight variations related to age and sex

Decades of research have documented exactly how cigarette smoke systematically damages every part of your respiratory system

But they were and there are over a billion smokers in the world