Not to that extent: it's against regulations in most cities from Singapore (obviously) to Saigon, and it's considered 'old people thing' in general. In Papua you see people with red teeth all the time, blood like stains on sidewalks accompanied by tiny zipper bags, which are very intriguing when you're out of context. I saw a mother giving betel to her 10 yo daughter on a boat ride - It is a bit calming, so...