Depends what you mean by “use”.
The Americans are the only ones to have used them in terms of destroying enemy assets (and sadly in that case it was used against civilians). But as a deterrent it’s been used by a LOT of countries all around the world and is still being used for that purpose right now.
An argument could be made the Cold War could have been an all out world war if it weren’t for nukes, with the short peace after WW2 be considered just a break and not the end.
I hope nukes won’t be used, but Ukraine is in trouble and if they are backed into a corner and facing destruction who knows what they will do. Same could apply to Iran before long, if they have the ability to get nukes somehow, it might be their only hope. Just please let it be as a deterrent and not actual nuclear war.
Just to add my 2 cents, it’s more likely a filter/drier from a refrigerator. Those are much more common, even though a sensor/thermal bulb looks very similar.