I won't deny that there's a lot of drug users who believe in new age spirituality, but there's another angle to consider too.

Some people have a genuine academic curiosity about human belief systems and the nature of experience. It is similar to how a Anthropologist might have many artifacts in their home or a religious scholar would have different religious text.

It doesn't mean that do you believe in everything, as much as that means that you enjoy being curious and engaging with different ideas.