John,
When I was an apprentice at Hurn, this accident came up as a cautionary tale. The culprit was leaky toilets not nicotine - apparently one not-so-popular mechanical engineer had made quite a career out of the repairs to the TransCanada Airlines (now Air Canada) Vanguards. Nicotine was always pointed out to us a great way of finding leaking rivets etc for pressurisation. A more recent problem with smoking is that, if the cockpit crew smoke (like DLH), then the crud gets all over the CRTs inside the displays - not able to be cleaned without removal & return to vendor for servicing. Made the top 10 on our CRJs!
Have a Happy & Safe New Year!