Hey Jen, just popping in with my own 2 cents.
Although many of the countries I've worked in/with coworking spaces don't have legalised marijuana, and sometimes even the opposite, I think of it as 'alcohol' in a way.
When working from a coworking space in London, the team next to me ran a 24/7 alcohol delivery service, but they were never found to be passed out on their desks after a long night of drinking.
I think if you treat the consumption of pot like you would smoking, excessive drinking or even something silly like hula-hooping, in a fair and community-acceptable way, it should sit nicely with both past and future customers.
(And as the protector of your community, you're allowed to turn away, or redirect customers who wouldn't be the right fit for your space. Just like you might not want a youtube 'vlogger' who pulls impolite pranks on people around them all day, working from within your space; or someone selling timeshares/MLM/etc)
Hope that helps in some way :)