OK, then why does the same effect seem to exist in Indians living elsewhere, and not among non-Indians in other smoggy places (e.g. China)? The smog factor was already accounted for. There's still something going on here, and several credible genetic/metabolic explanations are being examined. That's science. Presenting obviously-irrelevant facts as explanations is how science gets derailed (and apparenty the local tone police are more than happy to help with that).