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I have heard of the seals failing but have only experienced this one, maybe two times over the years (and being a flake smoker, much of my cellar is comprised of square tins)

As for ammonia, which is a strong respiratory irritant, its levels should be measured as part of the assessment of the hookah toxicant profile, and this could be achieved using a simple colorimetric method as was recently described for determining ammonia levels in tobacco fillers and sidestream smoke in different tobacco brands [93]

The FDA definition of devices encompasses software intended by the manufacturer to be used, alone or in combination for the specific medical purpose of diagnosis, prevention monitoring treatment or alleviation of disease and does not achieve its primary intended action by pharmacological, immunological or metabolic means

In section III.A.4

Doesn't matter who's throwing