This document discusses the dangers of secondhand smoke exposure for children. It notes that 40% of children are exposed to secondhand smoke, which can cause numerous health issues. Secondhand smoke contains over 7,000 chemicals, including 70 that cause cancer. It is linked to increased risks of ear infections, asthma attacks, respiratory symptoms and infections in children. To protect children, people should not smoke around them, make homes and cars smoke-free, and choose smoke-free public places and childcare facilities. Opening windows and using air purifiers does not eliminate the risks of secondhand smoke.