The 707 flight deck positions came fitted with ashtrays just forward of the briefcase compartment on each side, most smoked ( I didn't - Goody Two Shoes) but in those days so did the aircraft -remember those trails of black smoke ? - and I recall Capt's & F/o's smoking pipes and cigars as I sat at the Nav desk with the 'night flying' curtain pulled across and the oxygen mask clamped across my face. All flights were IFR - and that was inside the flight deck !
The nicotine residue used to bung up the pressurisation outflow valves, and cause pressurisation problems, sometimes.