The 26-year-old Frenchman reportedly shared a home-made cake containing three grams of cannabis with five of his colleagues at a butcher's in Chartres, south west of Paris.
"I didn't think twice, I thought it would be funny, it was just a hoax," the 26-year-old man said, reported L'Echo Republicain on Wednesday.
His colleagues weren't laughing, however - at least not that much. While one reported "fits of giggles", they also suffered from dizziness and an increased heartbeat. In fact, five of the team were sent to hospital and the shop was closed for half a day.
In sentencing the man, the judge refused to accept that the move was not premeditated.
"A cake takes work," he said. "There's plenty of time for reflection while you're adding the eggs, mixing in the flour, and leaving it to bake."
The butcher was handed an eight-month suspended sentence and a fine of €1,500.
Colleagues of the man revealed that he had been suffering from a break-up with another staff member, which potentially could have prompted him to bake and share the spiked treat.
The man was sentenced for possession of drugs, drug use, and administrating harmful substances with premeditation.
Cannabis pranks have seen others sentenced in France before, perhaps most memorably in early 2013 when a student left his teacher believing he was a bird after handing out home made cannabis cookies on an excursion.
The student was given a four-month suspended jail sentence and ordered to do 180 hours community service.