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 Disposable e cigarettes, popular among teens and young adults, are not as harmless as they may seem. Recent studies have revealed that these devices release toxic metals like lead, nickel, and antimony into Essential Guide to the Best Disposable Vape Pens What's really inside vapes? We pulled them apart to find out