Most of this is just marketing. Companies realizing that they can sell some tech gizmo by slapping a "smart" label on it. Technology isn't inherently "smart", but the application of technology can be smart. When done right it works as an amplifier to our abilities, like all tools do. I you're merely interested in tech for it's own sake, better to get a raspbery pi or arduino and make your own crazy shit, it doesn't need to be useful.