I went from pack-a-day Newports to Vaping at 36mg/ml. Within a week I was down to 18mg/ml. Within a year I tapered all the way down to under 3mg/ml (I mixed all my own juices).
I stayed right around 3mg/ml for about a year, then I moved jobs and could no longer vape in my office. It seemed quite pointless to go outside and vape since I didnt really have the urge, I was still vaping in the evening after work for another 2-3 months. I finally reached the point where the trouble was more than it was worth, and just stopped entirely.
So yes, I'm a big fan of vaping. Is it "safe?" Probably not. Is it less harmful than cigarettes? I dont think that is even in question, at all. Vaping is, at worst, a significant harm reduction for smokers and those around them. At best, it is a method of quitting cigarettes and have proven successful for MANY former smokers.
I really hate the direction things are going with regulation, because to me it looks a lot like PM and friends are using regulatory capture to ban everything but menthol vapes that they can afford to get tested, thus perpetuating their existence and granting them a lock on the market.