Smelling salts, hartshorn, and sal volatile were all ammonia inhalants, containing forms of ammonium carbonate. Cobain was also prone to alcoholism and regularly used drugs and inhalants. Inhalants are gases, aerosols, or solvents that are breathed in and absorbed through the lungs. For asthma, glucocorticoids are administered as inhalants with a metered-dose or dry powder inhaler. In the UK, marginalized youth use a number of inhalants, such as solvents and propellants. In 2009, Bettendorf, Iowa, amended its city ordinance regarding illegal inhalants to include organic substances. Inhalants are commonly used among minors, especially street children. This pine-scented oil is used in perfumes, bath products, and aerosol inhalants. Death from inhalants is generally caused by a very high concentration of fumes. Many inhalants act primarily as asphyxiant gases, with their primary effect due to oxygen deprivation. Inhalants can also be classified by chemical structure. Primus's 1998 song "Lacquer Head" is about adolescents who use inhalants to get high. A number of films have depicted or referred to the use of solvent inhalants. It is also possible to classify inhalants by the effect they have on the body. It may also be caused by the use of inhalants.