. >> reporter: 28-year-old kyle newton lost his mom, a lifelong smoker, to cancer and sees his products as a life-saving alternative. >> there are over 4,000 chemicals traditionally in tobacco. we end up with 12 or more, depending on the flavor. >> reporter: flavors like watermelon and chocolate, which critics say attract younger people. there's even a section on the menu called "like a kid in a candy store." e-cigarettes are not yet regulated in the u.s. and the fda warns consumers have no way of knowing whether they're safe. >> the marketing is way out ahead of where the science is. >> reporter: dr. pamela ling says without regulation, it's hard for users to know exactly what's in e-cigarettes. >> they think, well, this is just nicotine and harmless water vapor, and what's the big deal? actually, we know that nicotine is a highly addictive drug, and we don't know what the combination of chemicals in the e-cigarettes does to the body. >> reporter: but at xl parts in ft. worth where employees are allowed to vap on the job, they're convinced they're healthier.until i tried this. and now