Yes, they can! The room is different from the VR rooms in that it is providing external stimuli (scent, sights, sounds, etc.) so multiple people can experience it at the same time in mostly the same way.

Since the room has a mind-reading component, it could be played either that people entering would experience the first person's immersion, or the room could combine and blend the most relaxing scenarios of all of the people in the room in an attempt to make it work for all of them. Either way would be totally fine to play with!