Can you eat the stuff inside tea bags?
Also question is, is the stuff inside tea bags edible?
What's inside the tea bag should be pure tea leaves. Tea leaves are indeed edible. You will ingest more caffeine than you'd get out of a cup of brewed tea, as you would be eating the leaves (assuming we're talking about Camellia sinensis here).
One may also ask, what is inside a tea bag?
A tea bag is a small, porous, sealed bag or packet, typically containing tea leaves, which is immersed in water to steep and make an infusion. The tea bag performs the same function as a tea infuser. Tea bags can be used multiple times until there is no extraction left.
To be on the safe side, avoid those fancy silk or mesh toxic tea bags. Paper tea bags pose an altogether different threat. Many paper bags are treated with a compound called epichlorohydrin, which is used to produce epoxy resins and acts as a pesticide! To be even safer, trade in your bagged tea for loose tea.