Study: (Non FDA Approved) Vapes Emit More Toxic Metals Than Cigarettes Tobacco Reporter Are e cigarettes really a safer alternative to combustible cigarettes? New study reveals disposable vapes may be more toxic! Learn more about how a University of California, Davis study found that some popular Flavored tobacco sales restrictions and e cigarette use among California high school students Disposable E Cigarettes More Toxic Than Traditional Cigarettes UC Davis