Explanation:

 The tendu tree is found widely across central India. Leaves plucked from its shrubs are used to wrap bidi, the poor man's cigarette. About 550 billion pieces of bidi (rolled by 10 million people) are sold every year in India, according to the All India Bidi Industry Federation. Moreover, gathering tendu is labour-intensive and employs millions of tribals during the lean month of May, when they have very little else to earn from.