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While 20 cigarettes per pack is the standard in Canada, some countries may have different norms

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This petition asserted that the Product Safety Commission has jurisdiction over the tar content of cigarettes under the provisions of the Federal Hazardous Substances Act, which provides for regulation through labelling, or even outright banning, of hazardous or toxic substances, including any substance that has the capacity to produce personal injury or illness to man through ingestion, inhalation, or absorption through any body surface. In the past, certain other attempts have been made to oblige federal agencies to declare that cigarettes are properly subject to the Hazardous Substances Act, but these efforts have all failed

IL-1-dependent inflammation following exposure is required to maintain surfactant homeostasis in the lungs through production of GM-CSF.81 In another murine study, CS exposure increased pulmonary GM-CSF and AM accumulation