The ban affected any products out of China that contained any form of liquid or had batteries included in it.
The way some companies have got around the ban is to overland their consignments to Hong Kong and ship from there. HK because it is slightly different from the rest of China is still able to ship as per normal.
e-cig are based in Cixi city which is a long way inland, I imagine the cost of trucking orders to HK for on shipping was not an option for them and the decided to simply not ship.
My manufacturer does not have that problem, as are many other manufacturing plants, they are located in Shenzhen which is very close to HK. All my products are shipped from HK. The price for shipping is also less than if it was shipped from other parts of China. I have no idea why, but it means you guys benefit from the reduced shipping charges.