There is plenty of medical evidence showing that Vaping is safer then smoking cigarettes.
But to add on with personal experience. I bought my first E-cig about three weeks ago. I didn't intend to quit smoking as I have been smoking for 43 years this Summer. And have tried to quit many many many times. Wellbutrin, Chantix, Nicotine Gum, Patches, Lozenges, Inhalers, the works.
Absolutely nothing worked. The Chantix actually resulted in a 50% increase in tobacco use. Until I learned to hide the Chantix pack from site, because every time I saw it, I thought about smoking.
So I bought an eGo with a CE4 clearo when I went to the tobacco shop to buy my monthly supply of loose tobacco and tubes on my last visit. To try out. No plans on trying to quit.
Overnight I was only smoking two or three cigarettes a day. The urge was completely replaced immediately by the eGo.
In just three weeks my blood pressure has dropped.
My lungs are significantly clearer. No more whistle deep in my lungs. I can now climb, actually run, up three flights of stairs without being out of breath (not insignificant as I'm 54, weigh 285 lbs and have had six stents placed in my chest after a heart attack in 2007).
And I get approached when I'm out in public reading by pretty young women who want to know what the hell this thing is that smells like Mountain Dew (or Espresso, depending on my mood).