Have you experienced the Himalayan Crystal Salt Lamp?

I was passing by my favourite store the other day and was drawn in by a beautiful array of what I thought were simply lamps. I bought two because I thought they would make an interesting additon to my lamp collection. (I adore unusual lamps).

I was advised to leave them on permanently, as apparently the lamp starts to melt because effectively it is a lump of salt.

I slept all through the night that night with my lamp on, which I never do, and my breathing was much better the next day.

Curious I read the enclosed leaflet and saw it was “claimed” the lamps ionize air and help with a multitude of ailments including asthma. I have done a bit of searching for proof of the lamps effectiveness but there seems to be no conclusive evidence that they do what they claim to do. Any thoughts?