but exception is made for the use of bhang.
article: Cannabis in India Albeit illegal, usage is prevalent and some government-owned shops sell cannabis in the form of bhang. States have their own laws regarding cannabis, locally known as ganja.
You maybe already asked yourself "Is Cannabis in India legal?" In India Cannabis (or Marijuana) is illegal for recreational and illegal for medical use. About 3.2% of the people in India used Cannabis within the last year.