Well my first vapey loves were both from the US: The MLFB (100% USAian afaik) and later the Firefly 2 (designed/headquartered in Cali). I imagine that is true for quite a few peeps.
I wouldn't and don't feel the need to boycott the type of small business that makes artisan vapes and accessories. (I actually particularly approve of the type of business that is not aiming to make millions (or be bought out for millions) but to provide a service for vapers (or whoever) and a good income for the people who work to provide that service)
The only US vape I am really interested in currently is the FATX. Regarding that I'll wait and see how the tariffs are implemented. It is possible packages under a certain value may be exempt. Even still if I am in the position to absorb any additional charges I may go ahead and buy that but we'll see. If I don't it won't be as a boycott.
Other than that honestly the vapes I have interest in are european which is great as I would prefer to support as local as possible. This has nothing to do with the current international turmoil caused by the Mandarin King but is my philosophy generally: if I can buy locally I do, if not I try to keep as local as possible so if I can keep it within EU I will. And I feel quite lucky to have such desirable device made in europe as the TM2, Vapman, Couchlog, Musa etc.
To illustrate my feelings I would say this: I look at the classifieds often and usually dismiss the listings from North America because it seems wasteful to buy from across the Atlantic what I could buy here even if the price is good and the seller is willing to ship. For example there were some vapman for sale recently, I think from Canada, I was interested but thought why would I buy something that originated in Italy and travelled to North American and have it travel back when I could get one from Europe instead? That vapman went to North America, it is now there for people in North America to enjoy so I shouldn't get in their way!