Before I was just laid off, I worked for one of the larger DoD subcontractors here in the US. I wasn't the first ecig user there, but my former employer carbon copied the USAF's numb nuts policy of banning all ecig use indoors and regulating it to designated smoking areas.
I wasn't the first, like I said, but I was the most vocal. By my own count, I was directly responsible for getting 21 people off analogs and on to any number of ecigs-mostly starting people on eGo Twists. Since we all had to use the smoking areas, as our numbers rose, we ended up having the smoking area divvied up into the vape side and the smoke side. Some days I would only see a single smoker.
I took it upon myself to "donate" a lot of gear as well as juice. Some of the people who quit said my enthusiasm and instant answers (I carried a laminated card with bullet points of answers and facts) swayed them to give it a try, and they found that the time was right and successful! I only had one person go back to smoking at work, and he admitted he just wasn't ready yet.
I talked with management many times about changing or modifying the policy, but they were adamant that unless the Air Force changed their policy (and they were the lion's share of our work) they wouldn't do anything more. The feeling was that if we did end up banning smoking altogether, only then would there be any modification to the policy.
Afterhours and weekends, though, it was a wink-wink sort of thing. Never in the labs or breathing on equipment or modules, of course, but the impact of that many smokers ceasing in such a short amount of time became a "thing" at work. During one of our larger meetings with Program Managers, it was brought up and comments from "everyone feels better" to "nobody smells like an ashtray in the lab" were made.
I look back at this last year as an absolute triumph, as people I got to quit told me about people they had also got to jump into our little world of vaping. At this point, it's gotta be exponential now, and that makes me feel so damn good.