The IB courses try to integrate ToK into all the various other subjects, in the form of short in class discussions. For example, in Economics it points out that a deterioration of Terms of Trade isn't necessarily a bad thing, and then questions the use of language in restricting knowledge from passing outside the educated. Or in Physics, we talk about the various theories that attempted to explain things and failed. So we kinda do that.

However, it's only really taken as seriously as the students want it to be. In Economics, we never really talk about it, but it's in the textbook. In Physics, we mention it briefly, and then maybe argue about it because we're argumentative.