As we mentioned before, air purifiers with HEPA filters can help reduce particle concentrations by up to 85%, according to the EPA
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Marijuana users, on average, smoke only two to three times a month, so the typical exposure to marijuana is much lower than for tobacco. And marijuana is one where a lot of people dabble with it in their late teens and 20s, and some people continue with relatively low levels for a long period of time, Kertesz added
The amount of additional air drawn in varies from 10 to 80 percent and depends on the number, the size and the position of the holes