This involves using the dried leaves of Mugwort when heated, open up the energy flow throughout the body.  The practitioners claim it heats the whole body but of course this is impossible. Moxibustion in the US typically involves a smoldering stick of Mugwort held close to the surface of the skin.  Other ways smoldering Mugwort is used includes placement of the smoldering herb on the end of acupuncture needles or in small pots that are set on the surface of the skin in rows on the back. Moxibustion is part of the traditional Chinese medicine (TCM) system. 

• J Tradit Chin Med. 2014 Aug;34(4):392-400 Moxibustion was not superior to orthodox medicine in treatment of asthma 

Most moxibustion studies are of such low quality that for most conditions, no conclusions may be drawn as to the effectiveness.