Very less impact mainly in North East India and north west.
Tribal societies like bhutiya, lepchas, chakma and nagas. Monpas of Kameng and some tribes in Ladakh region.
Sometimes in Arunachal Pradesh follow mahayana Buddhism and khamti of lohit follow hinayana Buddhism. But tribals continue their traditional way of life.
Gompa with lama attached to it. but they also continue their traditional worship and separate priest. Haimendorf.