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Stephanie Matto says she's earning 6 figures just from farting into jars ... but all that gas is taking a bit of a toll on her health, both mentally and physically.

If ya thought buying NFTs was weird, the "90 Day Fiancé" star tells TMZ ... she's already banked about $100,000 from selling her jarred farts to fans, but her process almost put the artist in the hospital.

Stephanie tells us she usually sets aside 2 or 3 days a week to work on her hustle, eating foods typically associated with being gassy ... like beans and fiber bars.

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