There are some Sri Lankans who do that due to the British influence and I imagine in India as well, but that's not the case with most of the tea cultures.
Also, if you're doing this for health reasons, I strongly recommend avoiding milk and switching to green tea instead: http://www.npr.org/blogs/thesalt/2012/09/27/161895873/health...
> There are some Sri Lankans who do that due to the British influence and I imagine in India as well, but that's not the case with most of the tea cultures.
I wonder where the Mongolians got their milk-tea from. Probably not from the British.
http://en.wikipedia.org/wiki/Suutei_tsai
An old tradition among many Mongols was to not drink water straight. This could have been a result of the Mongols’ belief that water was sacred. It could also have come from the need to conserve water
If you're drinking the tea without milk, I can see preferring something weak.