it's season 13 episode 16 when Homer smokes weed its called " Weekend at Burnsie's"
"Homer the Whopper" is the 1st episode in the 21st season.
You might be thinking of "El viage misterioso de Nuestro Homer". Or possibly not. That's the one with the Guatemalan insanity peppers. However, the show's been on for twenty freakin' years; unless the writers are a lot more creative than I think they are, there's bound to be at least one more "Homer gets stoned" episode in there. theres really to more, there is one were he is addicted to licking exotic frogs (seriously) and he has to take medicinal marijuana (which is legal) in one episode. you could be talking about any one of these.. "Weekend at Burnsies" is the one where he is addicted to medicinal marijuana and "missionary: impossible" is where he licks frogs.
Deep Space Homer
There are several episodes of the Simpsons in which Homer sings to Marge. For example, there is the 4th episode of season 14.
The original airdate of The Simpsons' episode Homer Goes to College was October 14, 1993.
Homer of Seville
Mobile Homer
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The Cartridge Family is the episode when Homer Simpson gets a handgun.
Hungry, Hungry Homer
Homer the Great
Season 19 episode 2. It's called The Homer Of Seville