I think you're talking about LiteCigUSA maybe? I have no idea why they stopped shipping to PA residence. They have a B&M store in PA, so they are already selling to PA residents!
As far as I know, the PA tax has nothing to do with where you ship, it's where you receive your inventory and ship/sell from. So even though they do not ship to PA residents, they would still be liable for the 40% PA vapor tax on all inventory. And since they sell to PA residents in their B&M store anyway, this leaves me scratching my head. Of course, they didn't answer my email when I asked about it. But I would not expect a retailer with such low prices to answer emails very diligently LOL.
So there must be something to this whole mess that I do not know about.
This is no surprise, the PA state govt is VERY corrupt. I know, they all are, but PA is probably in the top 5 most corrupt state govts in the history of the USA.