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Spree, it's a Rails Engine and def my fav for 3rd party hosting.

How do you like that compared to something like Solidus?

Do you know anyone who is in the e-commerce space for marijuana/e-cigs/adult? What are they using for payments?

PsiGate is the common gateway and Magento / custom builds are pretty much the standard.

Most of the e-cig/vape sites I've purchased from are running WooCommerce.