Editing Effects of cannabis (section)

===Duration===
Peak levels of cannabis-associated intoxication occur about 20 minutes after smoking it and last several hours.<ref name="ReferenceA">{{cite journal | vauthors = Crean RD, Crane NA, Mason BJ | title = An evidence based review of acute and long-term effects of cannabis use on executive cognitive functions | journal = Journal of Addiction Medicine | volume = 5 | issue = 1 | pages = 1–8 | date = March 2011 | pmid = 21321675 | pmc = 3037578 | doi = 10.1097/ADM.0b013e31820c23fa }}</ref> The total short-term duration of cannabis use when smoked depends on the potency, method of smoking – e.g. whether pure or in conjunction with tobacco – and quantity. Peak levels of intoxication typically last an average of three to four hours.<ref name="ReferenceA"/> When taken orally (in the form of capsules, food, or drink), the psychoactive effects take longer to manifest and generally last longer, typically an average of four to six hours after consumption.<ref name="erowid.org">{{cite web|url=http://www.erowid.org/plants/cannabis/cannabis_effects.shtml|title=Erowid Cannabis (Marijuana) Vault : Effects|website=Erowid.org|access-date=9 April 2018|archive-date=19 August 2016|archive-url=https://web.archive.org/web/20160819023850/https://www.erowid.org/plants/cannabis/cannabis_effects.shtml|url-status=live}}</ref>{{Unreliable medical source|date=February 2011}} Oral ingestion use eliminates the need to inhale toxic combustion products created by smoking and therefore negates the risk of respiratory harm associated with cannabis smoking.