But the main reason is the increase in the amount of filter material used in cigarettes
Cephalalgia Int J Headache 31(3):331337 Kim SK, Chu MK, Kim BK, Chung PW, Moon HS, Lee MJ et al (2024) An analysis of the determinants of the health-related quality of life in Asian patients with cluster headaches during cluster periods using the time trade-off method

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For more parallels between the tobacco industry and the food industry, see: American Medical Association Complicity with Big Tobacco The Healthy Food Movement: Strength in Unity Evidence-Based Nutrition Big Food Using the Tobacco Industry Playbook What about the mobile phone industry