As a health professional with expertise in tobacco use and its effects on health, I can provide you with an informed answer to your question.

There isn't a universally agreed-upon number of cigarettes that defines a "heavy smoker," but generally, smoking more than 20 cigarettes a day is often considered to be heavy smoking. However, the health risks associated with smoking start with even just one cigarette, and the risks increase with the number of cigarettes smoked per day. It's important to note that any amount of smoking is harmful, and quitting smoking is the best way to improve one's health.

read more >>

In general, a light smoker is someone who smokes less than 10 cigarettes per day. Someone who smokes a pack a day or more is a heavy smoker. An average smoker falls in between. Sometimes a doctor will use the term pack year to describe how long and how much a person has smoked.read more >>