The app analyzes levels of preservatives known as nitrates and nitrites.
Chemicals have been detected in bottled water, perfume, toys, vinyl flooring and shampoo.
The team could determine the composition of the mixtures with 86 percent accuracy.
Alarmingly, some of the toxic chemicals were found in higher quantities than in earlier studies.
"We are now beginning to understand how e-cigarettes and the chemicals they contain are changing the oral microbiome and disrupting the balance of bacteria."
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"Once exposed to sunlight for two hours, zinc oxide destroys the UVA protection provided by other ingredients."