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First, tobacco naturally contains nicotine, an insecticide, which raises alertness, speeds reaction times, and stimulates the release of neurotransmitters such as dopamine, which are associated with pleasure

It puts a grosser taste in your mouth

[1] With a gastric ulcer, the pain may worsen with eating

This can cause temporary hearing difficulties or a feeling of fullness in the ear

To give a few examples: the vape company JUUL was marketing and distributing to school kids, black market e-liquids and even regular e-liquids didnt have any guidelines for what should be precluded as an ingredient, and users began modifying their e-liquids with drugs and extras that were never tested as an E-Cigarette ingredient