A study in the journal Tobacco Control revealed that herbal cigarettes produce similar levels of carbon monoxide as regular cigarettes
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Clin Infect Dis 42 (7), 897 (2006)
The following formula was used to determine the removal efficiency of heavy metals
They are now sold across Asia, Europe, Africa, Oceania, North America, and South America, covering duty-free and taxed markets in over thirty countries and regions, encompassing more than fifty such markets, as well as over one hundred domestic duty-free sales outlets
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