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Nothing, I scavenge the LiPo batteries out of them and trash the rest. Disposable they are NOT.

To be fair, I wasn't stopping to pick them up if there wasn't a personal gain from it, what @flemingfarm is doing is awesome, just to get the batteries out of nature. Good thing there aren't a lot of e-cigs on the ground here and I never thought about them having a battery in it, from now on IF I see one, I'll pick it up just to save nature, great idea!

Interestingly there are now big piles of garbage that has been picked up and bagged along the highway waiting to be taken off. The crews are out earlier this year to do the first pass. The center median still needs cleaning but they should get to that soonish.