“Cwan Iblis” ba kalmar da aka saba amfani da ita ba ce a cikin Ingilishi, kuma ba ta da ma’anar ƙamus. Duk da haka, wani lokaci ana amfani da shi azaman kalmar magana ko ɓatanci don komawa ga tsire-tsire daban-daban, musamman waɗanda ke da tasirin psychoactive ko kuma ana ɗaukar su cutarwa ko haɗari. Ɗaya daga cikin misalan shuka da ake kira "ciwan shaidan" shine Datura stramonium, wani tsiro a cikin dangin nightshade wanda ya ƙunshi mahaɗan hallucinogenic masu ƙarfi kuma ana ɗaukarsa mai guba a cikin manyan allurai. Wani tsiro da ake kira "ciwon shaidan" shine Cannabis sativa, wanda aka fi sani da marijuana ko sako. Yana da mahimmanci a lura cewa yin amfani da kalmomin kalmomi ko kalmomi don bayyana tsire-tsire ko abubuwa na iya zama da rudani kuma maiyuwa ba zai iya isar da kaddarorinsu ko tasirinsu daidai ba.