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They argued that mice studies won't tell us what's going on with humans with ADHD

[27] Georgia Accounting Office

It produced neither the polymer fume fever nor any other observable harmful effect. Man himself remains the only reliable indicator Humans develop polymer fume fever at an exposure of 0.4 milligrams, 500 times less than the amount that had no effects in dogs

Propionaldehyde emissions Figure 2 shows propionaldehydes quantity of all sticks of different flavor tested per device, both for ISO and Canadian puffing regime

Here are some of the UK airlines regulations when it comes to battery allowances and the number of electronic devices permitted (correct as of August 2025): British Airways You can bring up to 15 devices containing lithium batteries in your hand luggage