When it comes to cigarette smoking, there is no one-size-fits-all answer to the question of how many cigarettes constitutes a "heavy smoker." Generally speaking, a heavy smoker is someone who smokes more than one pack of cigarettes a day, which is 20 cigarettes. However, since smoking affects each individual differently, it is difficult to define "heavy smoking" with a single number.
For example, someone who smokes 3 cigarettes a day may be considered a light smoker if they are a new smoker and their body has not had a chance to become accustomed to nicotine. On the other hand, someone who has been smoking for years and is used to the nicotine may be considered a heavy smoker if they smoke 3 cigarettes a day.
In addition, it is important to consider a person's overall health when determining if they are a heavy smoker. For instance, someone who smokes 3 cigarettes a day but has no other health issues may be considered a light smoker. However, if a person has a pre-existing health condition, such as asthma or COPD, smoking even 3 cigarettes a day could be considered a heavy smoking habit and have a greater impact on their health.
Ultimately, the answer to the question of whether 3 cigarettes a day is a heavy smoker is subjective and depends on the individual. If you are concerned about your smoking habits, it is best to speak to a doctor or healthcare provider to get a personalized assessment.