Seems more likely that the o-rings will degrade no matter what, unless they're made of lab-grad, platinum-cured silicone, perhaps. It's possible the DMT may accelerate the degradation, but let's face it - this isn't something that manufacturers would routinely test for compatibility!
If you know what your o-rings are made of, you could check the compatibility of that material with other types of amines.
Some possible components of the mint flavouring have the potential to attack rubber too.
What kind of wick material was used? Was there any contact between the juice and any other materials such as any other kind of plastic, or brass terminal screws? What was the heating element made of?
If there's not much left, it's probably not worth the trouble of trying to recover it (if you were even considering this) - and the rubbery taste might simply be down to degradation of the DMT as well.
But it does seem likely that DMT salts might be less corrosive to o-rings than the freebase. Only a side-by-side comparison would really tell, though.
“There is a way of manipulating matter and energy so as to produce what modern scientists call 'a field of force'. The field acts on the observer and puts him in a privileged position vis-à-vis the universe. From this position he has access to the realities which are ordinarily hidden from us by time and space, matter and energy. This is what we call the Great Work."
― Jacques Bergier, quoting Fulcanelli