The Food and Drug Administration says it plans to regulate e-cigarettes, along with cigars and other tobacco products. Health advocates say it's about time, but many "vapers" who use e-cigarettes say regulation will damage a product that's a far safer substitute for cigarettes
Even health experts agree that electronic cigarettes might be useful in helping people who want to quit smoking. So where's the harm in them?

Mostly, it's the unknown, the FDA says.  "We can't even tell you what the compounds are in the vapor," FDA's Mitch Zeller told reporters.