Chifir is an exceptionally strong tea brewed in Soviet prisons and gulags. The brewing process causes some chemicals to break down (which doesn't happen in normal brewing). It's consumed for its stimulating and narcotic effect and is a banned activity. In one article, the sensations vary from face melting to jack hammering of the heart. https://en.wikipedia.org/wiki/Chifir
https://www.youtube.com/watch?v=ANSiTN9zmo4
https://www.quinteassential.co.uk/blog/chifir-russian-black-tea
