Drugs can shift your awareness in ways that enable it to expand, however since they are external they don't develop your own ability to maintain a higher, expanded awareness. So you receive some benefit from experiencing those states, which seems to loosen your habitual awareness. But all of those states are accessible from your normal consciousness, and accessing them through drugs does nothing to develop your ability to access them at will.
There are a few other pitfalls here: If you are dependent on something outside yourself for your spiritual experience, that's going to limit your growth. If you identify yourself with those behaviors, especially if you build your spiritual identity around that, that's going to invoke ego to protect the behaviors and identity and limit your growth.
So it can have benefits, but it can be an impediment as well. I think for someone enough awareness to not become attached, it can be a rich garnish to a well-rounded spiritual practice, but it should never be made a central part of the practice.
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