Maybe it's just me, but blowing into a toilet paper roll doesn't sound like much fun to me. I like to see the clouds. Personally, out of respect for the hotel, I would never combust in a non smoking room. However, with vapor I don't see the harm. Unlike vapor, smoke can have a lingering smell in the room, the draperies and bedding. Moreover, from my experience the vapor smell diminishes quite quickly and with a spray or two of cologne or perfume it's virtually undetectable after an hour or so. I've never had a problem with vaping in a hotel.