Tobacco

Tobacco was a plant that was often burnt and inhaled. It was used in cigarettes, cigars and smoking pipes. The First Doctor once smoked tobacco from a pipe. (TV: An Unearthly Child) Samuel Pike's smuggling ring often imported and exported tobacco. (TV: The Smugglers)

The Fourth Doctor told George Litefoot that there was no tobacco where Leela came from when she did not recognise what a smoking pipe was. Litefoot concluded it sounded healthy but exceedingly dull. (TV: The Talons of Weng-Chiang)

In the 21st century, cigarette boxes advertised that "SMOKING IS BAD." (TV: Out of Time)

Tobacco became rare in the aftermath of the 22nd century Dalek invasion. (PROSE: Legacy of the Daleks)

Behind the scenes
One of the filming locations for The Sun Makers was WD and HO Wills Tobacco Factory (now known as Imperial Park), Hartcliffe Way, Hartcliffe, Bristol. It was used for the rooftop scenes. Poor weather caused it to be often shrouded in mist.