most hotels only charge the smoking fee if there is evidence like ashes in the trash. just flush everything down and bring air freshener and get a smoking room
We actually had an issue when we were at a hotel recently, it's illegal to smoke in hotels and many other places here. So, anyhow, around 8pm we had a knock at the door and it was the hotel manager checking on us because someone complained about smoke coming from our room. No one in our room smoked anything in our room, and I had gone out for a cig like 3 hours before. I vaporized the cannabis I had with me, but hadn't done that in 6 hours. The manager could tell just by us opening the door that whoever complained was complaining about another room, definitely not us! I like vaping in general more than smoking. No obvious odor, and no remnants either. I keep my ABV in a baggie that goes in with my supplies.
Excellent tips here. My wife and I did something like this in our hotel room before a Tool concert. These three tips used together, especially the steam/fan in the bathroom will work. But don't turn the room/bathroom into a fog machine.