Pot

Pot \pot\ , noun;

Campfire dinner in a pot (source)

Pot comes from Old English pott ("vessel") and Old French pot, which both come from a general Low Germanic and Romanic taken from Vulgar Latin  *pottus, which is of uncertain origin.

One of the funny things about language is that two words can be very similar or exactly the same in form and be unrelated. Female and male are unrelated. As are pot the cooking vessel and this pot:

(source)

Pot meaning marijuana dates to 1938 and is probably a shortening of Mexican Spanish potiguaya ("marajuana leaves").