Zonnic doesn't say and the short search I conducted did not say. I would be surprised if they were biodegradable with the company not specifically mentioning that.
As an industrial mechanic who quit cold turkey while working, if you need a pouch like the people I see using it, it's not being used as a quitting aid. It's a replacement.
And they leave those pouches everywhere, like cigarette butts.
Just curious, you from a land locked region?