were they in a no smoking room? if so, the hotel can probably stop them from smoking. if not, " get a life"(William Shatner). there are so many worthwhile causes looking for your time and dedication.

in many jurisdictions smoking pot is legal. how did you know it was pot smoking? lots of stuff smells like pot.

what if the hotel throws them out of a smoking allowed room, and we find they were somking turkish latakia? is not the hotel then in deep pucky.