Berkeley researchers decided on this conversion rate by comparing the total death burden of cigarettes to the total death burden of exposure to PM2.5 pollution
While overall rates of emphysema were about the same between the marijuana smokers (75%) and the cigarette-only smokers (67%), the age-matched subgroup of marijuana smokers had higher rates of emphysema 93% compared to 67% of those who only smoked tobacco
[PubMed: 15229054] Weiss RB, Baker TB, Cannon DS, von Niederhausern A, Dunn DM, Matsunami N, Singh NA, Baird L, Coon H, McMahon WM, et al
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