As long as you don't need new gear, heads, or coils. Every proposed tax I've seen includes those as well.
I've thought of those too. I use and am very comfortable with mechanical mods, RBAs and RDAs, cotton, silica and SS mesh. I buy stainless steel and glass gear that will last a long time and is also easily repairable.
As for power supplies, making those is also pretty easy. All you really need is a battery, a switch and a way to hook it all up to a juice delivery device. Check out The Puck mod. That one is actually being used with NiMH rechargeable batteries that you can pick up cheap at Walmart.
For anyone who is reasonably handy and has made themselves self sufficient, the only thing that can become a real problem is nicotine.