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WHO global report on trends in prevalence of tobacco use 20002025 (Licence: CC BY-NC-SA 3.0 IGO)

The second method, the Canada Intense (CI) method also used two second drags, but were only thirty seconds apart and the filter vents were covered

Tamura U, Tanaka T, Okamura T, Kadowaki T, Yamato H, Tanaka H, et al

It is what most tests examine
