While the overall rate of dual use is similar in 2015 and 2026, it was significantly higher than usual in 2024 and 2025 (4%), but has fallen in 2026 (3%)
Rose eventually offered the patent to Philip Morris International (PMI, not to be confused with Philip Morris USA)
Step 4: Clean Vents And HVAC System The ventilation system often traps smoke particles, which can reintroduce odor every time you use the air or heat

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