Whenever mention of smoke in the toilet I'm reminded of the Air Canada DC-9 that had a fire in the toilet, for reasons not determined, cigarette, or initiated by an electrical issue. Crew were first alerted by popping circuit breakers, before a FA was advised by a passenger they could smell an odour of burning. 17 minutes from the discovery of fire to landing. 23 of the 41 passengers did not survive.
https://www.ntsb.gov/investigations/...s/AAR8602.aspx
The cabin conditions endured were unbelievable. Don't be too sanguine about prats having a smoke.