OP didn't say "all people in India" so your correction isn't at all necessary or helpful.
It's an understandable correction though. For instance, if one were to say "People in the US are are Nazis" you can be certain many people would argue that a correction is both necessary and helpful.
I remember hearing about this from family members and seeing it online. I understand it happens, but is it really healthy or just urban legend/religious BS?
Religious BS
It's considered a medicinal drink in some religions.