True. Also the vapour disinfects the lungs.
The side effect is that if you pour about a bottle of vodka on the hot stones you get pretty intoxicated.
Warning - we DO NOT do this if the Sauna has a wood heater, fed from inside the Sauna.
Normally we just pour water on the stones, to increase the humidity to unbearable levels...
But now we are going Off Topic.......
When our son was little, I tried several times to make a hot chocolate drink from Milk Chocolate bars, but found them sickly sweet. It was better to use bars type Lindt 70%.
I tried once to make it with the Lindt 99%, but it was not nice. Harsh, bitter, nasty.