I think the Hindu connection is right on (good one ElWorm!). They look very much like the diya (lamps) used for Diwali (not that I know what that celebration is about). But google Diwali diya and you see the same shape, and some with the same ancient swastika.
I guess if you try you can really learn something new everyday! Good thing I a) quit smoking over 2 years ago and b) I didn't find them, or they'd have been embarrassingly desecrated cause I never heard of such a thing...