I have to say that this would be a new issue for me!
I've been
vaping for over 5 years, and can honestly say that I have never once had a bee or wasp attack me while vaping outside... and I usually vape fruity flavors, with the occasional caramel, floral, vanilla custard... all the things that I would think might attract a bee... Sorry to hear that you have been stung, but I'd have to say that, in my experience, vaping shouldn't be the cause of it.
Maybe try vaping straight DEET?

j/k