The area is also home to large numbers of coconut and betel nut trees. The Lubanas buried a pice and betel nut. Bengali villages are buried among groves of mango, jack fruit, betel nut and date palm. From the number of the betel nut, the bridegroom's star is marked. Betel nut chewing can cause oral cancer. It is conjectured that ancient Indian literature provide information on betel nut and its mastication. Rituals offering include rice, chicken and betel nut. Some people also chew tobacco, marijuana or cocaine along with betel nut. Nowadays, coconuts, betel nut and dal are also offered. The chewing of betel nut is contributing to preterm birth rates among this. Over each heap a betel nut and a pice is placed. Betel nut chewing is a widespread practice in Taiwan. The flooring was made of wood from betel nut trees or of split bamboo. In the Indian subcontinent oral submucous fibrosis is very common due to betel nut chewing. Betel nut chewing has been shown to cause oral cancers.