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This has been observed across all age groups, making it a concern regardless of how long a person has smoked

Surprisingly, the implementation of increased rules and regulation has done little to slow the efforts of tobacco advertisements, as since 1981, as cigarette consumption in the United States have declined, tobacco industry expenditure on advertising and promotion have grown 10 times greater.[4] Even though the general public understands the health effects of cigarettes, these companies push even harder to lure in potential customers, and maintain current sales levels

For non-smokers, secondhand smoke could ruin even the quiet enjoyment and peace they should get within their own space

Police MdicaleCigarettes Mdicinales, Rapport gnral sur les travaux du Conseil de salubrit, 1840-1845 (Paris: Boucquin, Imprimeur de la Prfecture de la Police, 1847), 136-137

For a 300-square-foot room, target a smoke CADR of 200 CFM minimum

Use the critical value method and tables