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PMID 18442343

But after a more conservative government came into power in 2023, that law was scrapped

A Pilot Study on Nicotine Residues in Houses of Electronic Cigarette Users, Tobacco Smokers and Non-Users of Nicotine-Containing Products. March 19

The first use of a filter in its current form was in 1931 with Benson & Hedges' Parliament. However, the filter at that time was not intended to remove harmful components, but rather to prevent tobacco flakes from getting on the smoker's lips

That way, if anything abnormal happens, if there is a short-circuit, or if a component fails and causes that circuit to draw more amps than safe, the fuse blows and protects the wiring and other components in the circuit