If it helps for anybody's calculations, I just attempted to weigh a soda tab. Unfortunately, my balance isn't sensitive enough to register something so light. But just from feel, I'd say it's probably 1 - 2 grams and certainly less than 5 grams.

Cheers

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"Life is too short for grief. Or regret. Or bullshit." -- Edward Abbey, Vox Clamantis in Deserto