cannaphile
A person who is well-versed and educated in all things having to do with the culture of pot, marijuana, cannabis, weed, etc. This can include, but is not restricted to weed dealers, bong shop owners, musicians, Rastafarians, hippies, grow-house owners... It can also be used as a more respected label than the more commonly used terms, stoner or pothead.
Judd Apatow's films always have some kind of reference to marijuana. He's a true cannaphile.
Cannaphile
a person who studies and is knowledgable in all things cannabis.
Tommy is a true cannaphile, this dude knows every strain and THC level of each one man!