Or an inventor can patent a device, put it in the market, and half the world can steal the design with no recourse... Of course this doesn't apply to ecigs, but in general, just because something can be stolen without punishment doesn't make it ok to steal.
I agree with you but as far as I know, that's not what we're talking about here. I live in the United States and so everything I buy is subject to U.S. patent law. Foreign inventors can patent their stuff here if their concern is having it copied anywhere else and sold here. Not much I can do about what happens half a world away lol.
If we want to expand the discussion, there are avenues to pursue to obtain and enforce patents internationally. I limited my discussion to the U.S. to avoid over-complicating the discussion.
The patent system is well known the world over and if an inventor chooses to forego obtaining patents, then invention is in the public domain. As one man's opinion, I would not hesitate to buy a product in the public domain and I wouldn't give it a second thought. Likewise, I would not knowingly buy anything that infringed a valid patent.