Enlarged tonsils are usually a sign of infection or irritation if you are exposed to smoke and polluted air.
The tonsils are two small glands inside the back of your throat. Tonsils are also a part of your immune system that help fight against infections.
Persistently enlarged tonsils are also known as tonsillar hypertrophy. It is most common in children because they have larger tonsils than adults, as their bodies are often too busy fighting off frequent colds and other viral infections of childhood.
In children, the tonsils will get smaller on their own as they age. However, adults can be also affected by enlarged tonsils. Some people have naturally enlarged tonsils with no cause.