Many of them have HEPA air filters
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For instance, Michael Lovenheim's paper uses Current Population Survey Tobacco Supplements data for metropolitan statistical areas in most years between 1992 and 2002, while DeCicca, Kenkel and Liu employ nationwide survey data from 2003
In addition, the devices are frequently less expensive than cigarettes and come in a range of shapes and tastes
With ADHD medications, both options are challenging to perform