Final answer:
Grape, cinnamon, and cherry are e-cig and vape flavors that may contain cytotoxic compounds, according to a study from the Harvard School of Public Health.
Step-by-step explanation:
Based on a study completed in 2015 by researchers at the Harvard School of Public Health, flavored e-cigarettes may contain cytotoxic compounds. The study found that about three-quarters of flavored e-cigarettes tested contained diacetyl, a chemical that can cause a lung disorder called bronchiolitis obliterans, also known as 'popcorn lung.' Therefore, the flavors that may contain cytotoxic compounds include: