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In 2009, the FDA found that e-cigarette cartridges from two leading brands contained detectable levels of known carcinogens and toxic chemicals, including diethylene glycol (commonly found in antifreeze) and nitrosamines

Our work focuses on comparing differences in their brain structures, particularly the olfactory system, to better understand the evolutionary adaptations

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For example, in New Zealand (trends in smoking prevalence by sex 5 ), Spain (geographical distribution of smoking prevalence by age and sex 6 ), and the United States (trends in smoking-related mortality by age and sex 7 ), research has also focused on smoking prevalence for sub-populations