Of the flavors tested, strawberry, coffee, and menthol-flavorings had the most toxic effects
Smoking Caused Diseases: age-related macular degeneration, aortic aneurysm, adult asthma, atherosclerotic peripheral vascular disease, blindness, cataracts, chronic obstructive pulmonary disease (COPD), congenital defects from maternal smoking, coronary heart disease, diabetes, early abdominal aortic atherosclerosis in young adults, ectopic pregnancy, erectile dysfunction, hip fractures, immune function, periodontitis, pneumonia, reduced fertility in women, rheumatoid arthritis, stroke and tuberculosis
Dobin A, Davis CA, Schlesinger F, Drenkow J, Zaleski C, Jha S, et al
How are they being used
They are designed to reduce harmful effects compared to conventional tobacco cigarettes