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Though not really "food" - if you're an addict you might feel compelled after a meal to participate in perhaps the most disgusting habit known to man - paan chewing.

This paan-maker starts with a betel leaf and slathers it with lime paste. On top he puts an areca nut and other ingredients - spices and maybe some tobacco. People pop this concoction into their mouths and chew it. After about 10 or 20 minutes they spit out a red liquid which you see splattered everywhere - on streets and sidewalks, on the sides of cars and buses.

You can always tell a paan chewer even when they're not chewing. Their mouths are coated crimson and they have no teeth - another effect of this addiction.