I can't see CC companies shutting down business that can't hit $600k/yr in CC billings.
$50k a month in CC billing and above would be about zero Canadian vape shops and likely much less than 10% of US ones. A hugely successful vape shop in Canada would do about $2k US a day and a lot of that in cash for obvious reasons. Most would do $400-600/day.
I've already seen problems with vaping and credit cards and it wasn't even due to an outright ban.
A while back some major vaping products sites were seeing their customers' credit card information compromised. Personally, I was hit three different times with three different cards. And one of the companies is among the very largest, and in this case the problem went on for a very long time after it came to light.
During the uproar online over this train wreck, people were researching and some vendors stepped forward with additional information. According to them, it was very difficult for a vaping products company to be approved by the mainstream credit card processors since the entire industry was considered to be less than desirable. Though they're not the same as a dedicated card processor, think of Pay Pal (along with eBay for that matter).
I'm not sure if their stance was due to the imagined tobacco relationship, too many chargebacks, or something else. Regardless, more than a few companies verified they had been turned down simply because of the nature of their business. And to be honest, there was no doubt some who went to the smaller processors just to cheap out.
So they had to turn to second or third tier processors who were not nearly as large and respected as the leaders. Those companies accepted a lot more fringe companies, but for either their relative lack of funds or just indifference, they were not known to have security measures anywhere near the top tier.
For some reason I'm being overly lengthy today, but the point is that huge pressure has been put on the vaping world in regards to accepting credit cards, and I wouldn't be surprised to see even more in the future. As if we needed more doom and gloom.