I am currently smoking a pack every 2 to 3 weeks. As it gets colder where I live, that will likely go to a pack a month or even longer. In early 2015 (during winter months), I was routinely taking days off, and up to 10 days without smoking.
I am now a moderate smoker. I have 100% control over my recreational choice to continue smoking. When I had previously gone cold turkey, moderate smoking was not seemingly possible and it was all or nothing. Had I smoked a couple of cigarettes a day for at most 3 days, I would've felt a loss of control and likely gone up to my PAD habit. I can't recall the last time I smoked a PAD, but if I somehow managed to do that tomorrow, I strongly believe I could exercise (100%) control to be down to moderate smoking within 3 days.
I get what you're saying about credibility, but have thought about that enough to say there would be even more if one were to not smoke and not vape but still advocate for vaping. I look forward to meeting those type of people, as long as they are not anti-smoking. If they are, I'd probably tolerate them, but not really see them as consistent with their rhetoric and/or I'd love to enter into discussion, possible debate, about what it is they really think (about smoking and vaping).
For me, vaping like smoking, needs to be established as a recreational activity. That it is currently 50/50 on it being a recreational activity and a smoking cessation wonder is okay given that it is still new and that there is a visible transition occurring in our (world) culture. It can be both recreational and smoking reduction/cessation, but I really feel strongly that foremost it ought to be treated as recreational activity. I think we have set ourselves up politically by marrying the use of eCigs to smoking (cessation) and that we then have to jump thru political hoops to claim it is so not like smoking, and is entirely distinct. If it is truly distinct, then it wouldn't be a cessation activity, for in that way it really is advocated like a wonder drug. And is something we've been nailed on, yet won a court battle based on idea that it is actually, as in really really, a recreational choice. Scolded publicly to stop claiming it will lead to smoking cessation, unless industry really wants FDA to treat it as a drug. IMO, no vaping vendor needs to go there as word of mouth in the information age can easily cover that. If industry sticks to recreational aspect, then politically aware vapers can stick to correcting zealot rhetoric and stave off their attempts to treat vaping as if it is just like smoking.