The video discusses the harmful effects of smoking, highlighting its role as the leading cause of lung cancer and emphysema. It explains how these diseases damage lung tissue and impair breathing. The video also covers asthma, describing it as an allergic and inflammatory response that constricts airways, and lists common triggers and treatments. Finally, it addresses the common cold, noting that it is caused by viruses and typically resolves within a few days.

What is the common cold and how does it affect people?

How do viral infections affect the respiratory system?