Well, I have never been in the closet.
I will write letters, sign petitions, talk with people, even march. I have marched in other times and places. I actually was hoping for a march in D.C. since I live very close by there. But I will still have a care with my vaping. I don't think it pays to chance causing bad PR. There's a proper venue for battle, and I don't think people's air space is it.
Still, I will stealth vape when and where I can. To the OP- I could not go 10-12 hours, unless I was asleep the whole time. I would have to figure something out to get me through. Is there anything you can add to (or take away from) e-liquid that will prevent vapor from being visible?