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There are a number of religious prohibitions in Sikhism.
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Not all Sikh-identified people subscribe to these prohibitions. The Sahajdhari Sikhs reject most of the prohibitions, including trimming of hair (Kesh). 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 (cannabis sativa), opium and other narcotics to help in mation saying that it is puratan maryada (Punjabi for "old tradition"). Bhang is common in India; according to a legend, even the Hindu God Shiva 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.