But the herbal sauna can do even more, if you don't like the infusions that much, you'll be happy about the hanging herbs, which very gently release their essential oils into the air when it's warm. And everyone knows about the healing properties of herbs, which is why this sauna is so popular with so many visitors. The longer a sauna system is used, the more intense the smell inside the sauna becomes, as the oils gradually embed themselves in the sauna wood and give off a light scent even without active herbs.