Other than twisted420, I cant think of another time I have seen a black person vaping. Its a bit odd, my favorite vape shop is right smack in the middle of a predominantly black community. The majority of vapers I run into are usually younger white males, most with an excessive amount of visible piercings and tattoos. But I also see plenty of older vapers, as well as women, just not as many. The vaping culture seems to be mostly white, followed by Asian.
That's probably just in your area, in the DC Metro area (which includes MD, Northern VA and as far out as the Eastern Panhandle of WV) you'll see plenty of Blacks Vaping (me for another) It does seem strange that you don't see more considering it's location you explain. While I agree with the majorities you've stated, I also see it becoming more popular across all ages; male and female. I myself am 46 and every time I'm in the local B&M I see the crowd becoming older and older.