A: Cedar wood and its oil have been used from 3000-4000 years ago to prevent or cure illnesses throughout the regions. Any kind of wood, including cedar wood, might be harmful to human health if its wood dust is inhaled in an enormous amount in a closed space such as a saw mill or a wood factory. But the normal use of a sauna made with cedar wood is safe to the human body. No case has been reported to any government agencies or research institutions throughout the world regarding the health problems related to using a cedar wood sauna. If a company tells you that they are using another type of wood for any other reason then because it costs less, you are not being told the truth. The only reason not to use Cedar would be if you were allergic or did not want to pay for the premium.