There are a number of religious prohibitions in Sikhism.
Haircuts: Cutting or removing hair from any body part is strictly forbidden despite shaving or trimming facial and nostril hairs for both Amritdhari and Keshdhari Sikhs.
Intoxication: Consumption of drugs, alcohol, and tobacco, and other intoxicants is not allowed for Amritdhari Sikhs and Keshdhari Sikhs. Drugs, alcohol and tobacco are forbidden for all. Cannabis is generally prohibited, but ritually consumed in edible form by some Sikhs.
Blind spirituality: Superstitions and rituals should not be observed or followed, including pilgrimages, fasting and ritual purification; circumcision; idols, grave worship; compulsory wearing of the veil for women. Observation of the 5 K's, is not considered blind superstition.
Material obsession: Obsession with material wealth is not encouraged in Sikhism.
Sacrifice of creatures: Practices such as sati and ritual animal sacrifice to celebrate holy occasions are forbidden.
Worthless talk:Bragging, gossip, lying, slander, "back-stabbing", etc. are not permitted. The Guru Granth Sahib tells the Sikh, "Your mouth has not stopped slandering and gossiping about others. Your service is useless and fruitless."
Priestly class: Sikhism does not have priests, as they were abolished by Guru Gobind Singh'. The only position he left was a Granthi to look after the Guru Granth Sahib; any Sikh is free to become Granthi or read from the Guru Granth Sahib.
Eating meat killed in a ritualistic manner : Sikhs are strictly prohibited from eating meat killed in a ritualistic manner, or any meat where langar is served. For many Sikhs eating any meat cooked by Jews and Muslims is believed to be forbidden, but this is not a universally held belief. The meat eaten by Sikhs is known as Jhatka meat.
Having extramarital sexual relations: Adultery is prohibited meaning Sikhs are not allowed to cheat onhusbands and wives.
Cutting turbans whilst worn: Cutting turbans too short when worn will be damaged by scissors as it is strictly forbidden the same way as cutting hair.
Swimming water through turbans:Swim caps are a different head gear to wear as a substitute to turbans when all Sikhs go toswimming pools at leisure centres.
Photography inside temples: Sikh temples are ruled to switch off the cameras in golden areas.
Headgear changes on motorbikes:''' Motorcycle helmets are not allowed to replace turbans or fit over turbans whilst riding motorbikes.
Violation of prohibitions
Not all Sikh-identified people subscribe to these prohibitions. The Sahajdhari Sikhs reject most of the prohibitions, including trimming of hair. Some young Sikhs are now cutting their hair to the dismay of spiritual leaders. According to the Sikh clergy, "the fad among youth to shed the pagri" is being observed more commonly among the Sikh youth in Punjab than Sikhs in other Indian states. Nihang Sikhs of Punjab, who are defenders of historic Sikh shrines, are an exception and consume an intoxicant called bhang, opium and other narcotics to help in meditation saying that it is puratan maryada. Bhang is common in India; according to a legend, even the Hindu GodShiva was fond of bhang and it became his favourite food. In 2001, Baba Santa Singh, the Jathedar of Budha Dal, along with 20 Nihang sect chiefs, refused to accept the ban on the consumption of bhang by the highest Sikh clergy. Baba Santa Singh was excommunicated and replaced with Baba Balbir Singh, who agreed to shun the consumption of bhang. The Udasis, who consider themselves as a denomination of Sikhism, lay emphasis on being ascetic, thus violating the "Non-family-oriented living" principle. Sri Chand, the ascetic son of Guru Nanak, was the founder of the Udasi.