My.02
If you don't get a patent...
The other option is to take your designs on paper as well as finished pipe examples and mail them to yourself. One UPS, one Fedex, and one USPS. Send them (on the same day) overnight or 2 day in those hard to open envelopes/boxes. Date all the paperwork inside and put a note about what you're doing and why. Then send those, signature required, to yourself. When you get them, go online and print out the delivery conformation and tracking history and put that with the UNOPENED packages in a save/secure place. THEN, if anyone ever tries to sue you over your own designs, you have documented, sealed evidence that you had the working, produced designs at least by the date you mailed them to yourself. Chances are, anyone trying to rip you off could not produce any documentation that they had the idea prior to when you mailed them to yourself.
At this point, you are making actual pipes, only they are vaped instead of smoked. You're a pipe-maker. China will never be a pipe-maker. They make product out of plastic or really cheap wood and it won't stand the test of time. That's why they're cheap. And honestly, there is a market for that stuff because not everyone can afford a $200 + pipe. BUT, everyone would prefer to have the nice, customized, hand-made, one-of-a-kind epipemods pipe. So there will always be a market for your pipes regardless of the copies. Plus, as others have stated, the market is moving so fast, someone could theoretically come out with an even better design by the time your patent is finished and you start production. Then think of all the sales you would have lost in the meantime!