[markkat]

Works for heart disease and likely all cause mortality.

https://pubmed.ncbi.nlm.nih.gov/30486813/

https://pubmed.ncbi.nlm.nih.gov/35908583/

[Gatsky]

This is almost certainly confounded with other healthful behaviours. Eg people who sauna also eat better, exercise, go to the doctor etc

[soperj]

Pretty well everyone I knew in Finland would sauna, regardless of how they lived the rest of their life, it was just part of the culture.