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HEETS were discontinued globally in 2025 alongside the IQOS Originals and Duo devices

Based on information gathered at each exam, participants were categorized as never smokers, current smokers, recent quitters people who had stopped smoking since their last exam and long-term quitters

To answer this clearly, it helps to understand how nicotine moves in smoke, what activated carbon can trap, and why results can vary from one filter to another

Forty-four students who had used e-cigarettes were recruited as the case group, and 44 as controls who did not use e-cigarettes, were matched (1:1) to cases of the same age and gender