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It is not known if smoking-associated changes in oral amino acid levels are directly associated with plasma levels, but connections between oral disorders and decreased plasma amino acid levels have been reported [96, 97]

(d) If you have not sent the split specimen to another laboratory for testing, you must retain the split specimen for an employee's test for the same period of time that you retain the primary specimen and under the same storage conditions

A spokesperson for the UK Vaping Industry Association said it wanted more government action to stop children buying vapes, but it opposed a ban on single-use devices