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Some cruise lines also impose limits on how many cartons can be sold onboard in a single transaction

For e-cigarettes, public supports health warnings & ban on sales to minors

Thus, the discolorations themselves are not considered dangerous

If so, nicotine is the likely culprit

This dentist in Decatur TX also adds that, over time, exposure to these harmful chemicals can contribute to oral health issues such as staining of the teeth, gum irritation, and an increased risk of cavities and gum disease

It has also been hypothesised that nicotine might increase the risk of neuroinfection. In the end, the studies conclusions are wishful thinking, Murray said