Editing Copper (section)

=== Human exposure ===
In the US, the [[Occupational Safety and Health Administration]] (OSHA) has designated a [[permissible exposure limit]] (PEL) for copper dust and fumes in the workplace as a time-weighted average (TWA) of 1&nbsp;mg/m<sup>3</sup>.<ref>{{PGCH|0151}}</ref> The [[National Institute for Occupational Safety and Health]] (NIOSH) has set a [[recommended exposure limit]] (REL) of 1&nbsp;mg/m<sup>3</sup>, time-weighted average. The [[IDLH]] (immediately dangerous to life and health) value is 100&nbsp;mg/m<sup>3</sup>.<ref>{{PGCH|0150}}</ref>

Copper is a constituent of [[tobacco smoke]].<ref>[[OEHHA]] ''[https://oehha.ca.gov/chemicals/copper Copper]''</ref><ref name="TalhoutSchulz2011">{{cite journal|last1=Talhout|first1=Reinskje|last2=Schulz|first2=Thomas|last3=Florek|first3=Ewa|last4=Van Benthem|first4=Jan|last5=Wester|first5=Piet|last6=Opperhuizen|first6=Antoon|title=Hazardous Compounds in Tobacco Smoke|journal=International Journal of Environmental Research and Public Health|volume=8|issue=12|year=2011|pages=613–628|issn=1660-4601|doi=10.3390/ijerph8020613|pmid=21556207|pmc=3084482|doi-access=free}}</ref> The [[tobacco plant]] readily absorbs and accumulates [[heavy metals]], such as copper from the surrounding soil into its leaves. These are readily absorbed into the user's body following smoke inhalation.<ref>{{cite journal|title=Investigation of Toxic Metals in the Tobacco of Different Iranian Cigarette Brands and Related Health Issues|journal=Iranian Journal of Basic Medical Sciences|volume=15|issue=1|pages=636–644|pmc=3586865|year=2012|last1=Pourkhabbaz|first1=A.|last2=Pourkhabbaz|first2=H.|pmid=23493960}}</ref> The health implications are not clear.<ref>{{Cite journal | doi=10.1080/15216540500459667| pmid=16393783|title = Metals in cigarette smoke| journal=IUBMB Life| volume=57| issue=12| pages=805–809|year = 2005|last1 = Bernhard|first1 = David| last2=Rossmann| first2=Andrea| last3=Wick| first3=Georg| s2cid=35694266| doi-access=free}}</ref>