They might be trying to indirectly generate revenue from legal marijuana.
Places like Vegas have a huge amount of recreational sales to tourists. They're clearly smoking the product somewhere, and it's not on the casino floor. One might bet they are engaging in some amount of activity with the potential to generate revenue for the hotel.
This. I've noticed a lot more smoke smell in hotel rooms in the last five years but it's always cannabis -- not tobacco -- in states that have legalized it for purchase but still disallow its use in public spaces.
Places like Vegas have a huge amount of recreational sales to tourists. They're clearly smoking the product somewhere, and it's not on the casino floor. One might bet they are engaging in some amount of activity with the potential to generate revenue for the hotel.