13.7.5 Pipes and Smoking

Some defences, such as an anti-weapon field (created by smoking the skullcap
plant), and some cures are effected by smoking plants. To do this, you
simply find yourself a nice pipe, PUT <whatever> IN PIPE, LIGHT PIPE (you 
must have a source of fire, such as a tinderbox in your inventory), and then
SMOKE PIPE. 

A lit pipe will eventually go out if you don't smoke it now and then, but 
you can simply relight it.