How many cigarettes are smoked worldwide each year?

How to get close to this number

Work from smokers, not from population. Roughly a billion people smoke, a regular smoker gets through something on the order of ten to twenty a day, and there are 365 days in a year. Multiplying those three gives a figure in the trillions directly, and it is one of the cleanest three-factor estimates on this site.

The per-capita framing in the explanation is the one that recalibrates it: around seven hundred cigarettes a year for every person on Earth, smoker or not. Dividing a global total by the whole population — including the majority who smoke none — is a good habit, because it converts an incomprehensible total into a number you can weigh against your own experience.

The environmental note is the one people rarely expect. Cigarette butts are the most collected item on the world's beaches, ahead of plastic bottles and bags, because filters are made of a slow-degrading plastic and are discarded casually in enormous numbers. A consumption statistic turns out to also be the largest single item in a waste statistic.