Everyone can, there’s no legal issues with it. Same as wheelchairs. You can buy and use one if you like. Of course, people will be weirded out if you do it, but there’s absolutely nothing illegal about it.

That said, I’ve never needed a cane even though I’ve been trained to use a ‘recognition cane’ to cross the street (I went to a school for the visually impaired, where they teach everyone how to do that).