I would argue that any compulsory repetition will become habit forming eventually, because life wants to find harmony with its environment, and in any context of life aside from modern humans, whatever you encounter routinely is a factor that needs to be adapted to in order to survive. I do not think that dopamine is required for this to occur. Cognitive dissonance, bias, and reflex alone suggest your neurons really want to use what they know already instead of unlearning and re-learning, which is why rehabilitation of any poor conduct is difficult. If you learned self-destructive or outwardly harmful patterns, that is what your brain knows how to apply and it wants to work with what it has just like any other brain.