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Early humans relied on methods like: Friction-based fire-starting (e.g., rubbing sticks together) Flint and steel (striking flint against steel to produce sparks) Magnifying glass or sunlight (focusing sunlight to ignite tinder) These methods were used for thousands of years before any chemical or mechanical fire-starting tools were invented

PG is widely used in e-liquids as a carrier for nicotine and flavour, helping deliver a satisfying throat hit

If absorbers and filters provided complete protection against harmful substances, they would absorb nicotine itself, and the effect of smoking would not be felt

The researchers also wanted to gauge if the plastic polymer film filter, which aims to cool the vapour, might pose a risk to health