Smoking

Aboard the SS Madame de Pompadour, smoking was done within smoking pods. (TV: The Girl in the Fireplace)

The First Doctor smokes a pipe. (TV: An Unearthly Child)

Behind the scenes

The smoking Cyberman.

The 2013 docudrama An Adventure in Space and Time opens with an actor portraying a Mondasian Cyberman smoking a cigarette on the set of The Tenth Planet.

According to NOTVALID: How The Monk Got His Habit, which is not accepted as a valid source for in-universe articles on this wiki, the fifth incarnation of the renegade Time Lord who would become the Monk spent some time in the 1970s and developed a smoking habit which caused his voice to become gravelly.