Juul is 35% owned by Altria (formerly known as Philip Morris, Inc.). Vuse, another large ecig company, is wholly owned by Reynolds American, the second-largest tobacco company in the US and a subsidiary of British American Tobacco, the largest tobacco company in the world. At this point, the ecig industry is big tobacco.
These are the mainstream e-cigs. Vape shops pushing disposables is still a big market. There will be no new cigarette companies. As long as you continue the whack-a-mole against new entrants your customer base is protected.
Altria surely didn’t want Juul to get regulated out of existence. But the rest of the majors did.
I can't decide if you're expecting people to answer yes, as if Big Tobacco is nobbling the competition, or no (because Big Tobacco owns huge stakes in the e-cig companies).