The episode is from the 13th season, it is called: "Weekend at Burnsies."

Below are two links that you can watch this episode.

Site 1

Site 2

Happy Tokin'
KiEfBoyjBm Reviewed by KiEfBoyjBm on . IF YOUR UK QUICK QUCIK CHANNEL 4!!! CHANNEL 4!!! ITS THE EPISODE WHERE HOMER SMOKES DOPE!!! Rating: 5