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Although commercial devices like the Vitrocell System (GmbH, Waldkirch, Germany), designed for biological studies 20 , may provide some reliability 4,12,15 , they do not adequately simulate oral environmental consistency 19 , and are unable to provide uniform smoke exposure
Its so easy to become consumed with the process and process improvement that we lose sight of how our best intentions affect others
However, an increasing number can also be used for MTL vaping
It is also important to note that metal components are often found in higher concentrations in less expensive products (24, 138140), which would presumably be purchased at higher levels by those of lower socioeconomic status or adolescent users with limited income