Define one occasion consistently
Decide whether to count only active smoking or the full interruption. Use the same definition for every occasion so the total can be understood.
Use separate day types
If workdays and weekends differ, calculate each pattern and combine five workdays plus two weekend days rather than forcing one daily average.
Avoid inflated lifetime claims
A yearly estimate is already sensitive to changing habits. Projecting decades assumes a pattern and life circumstances that may not continue.
What to keep in mind
Common questions
Should buying cigarettes count?
It can, if that time is part of the question you want to answer. List it separately to keep the estimate transparent.
Why not show a lifetime total?
It amplifies uncertain assumptions and can look like a promise. Shorter periods are easier to understand and verify.
Sources
Multiply the average minutes used for one smoking occasion—including walking, waiting and preparation if relevant—by the number of occasions per day. This gives a time budget, not a promise of productivity.
This page provides general education, not a diagnosis or personal medical advice. Symptoms, pregnancy, medication questions and individual risk should be discussed with a qualified local professional.