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Your tube slips off because tobacco crumbs are sitting on or around the nozzle, so the machine cannot grip the tube end cleanly

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Reviewing evidence on who is using e-cigarettes, patterns of e-cigarette use and the relationship of e-cigarette use to smoking behaviour provides important information when considering the impacts of e-cigarettes on public health

67 For such a product to be exempt, FDA must determine that (1) the modification would be considered minor, (2) an SE report that demonstrates substantial equivalence would not be necessary to ensure that marketing the tobacco product would be appropriate for protection of public health, and (3) an "exemption is otherwise appropriate." 68 Before the product can be legally marketed, FDA must first grant the product an exemption from demonstrating substantial equivalence