@ JSL ... to the best of our experience they are effectively odourless. I'll put it another way, the T5 Sofitel didn't bill us £250 for cleaning the room after using them last month!!
It's that '
prisoner' factor that actually got us started on them. We can do the TATL, but being stuck in the hotel from 1400-0900 without 'skipping behind the bike sheds' was just unacceptable to us.
A couple of puffs to get the nicotine level back [no need to smoke a complete ciggie, costing £0.25+] and you're sorted.
[PS .. feel free to PM for a lot of detail. The others won't want to know about us dirty people.]