By Tom Victor An unnamed Premier League footballer has checked into rehab for laughing gas addiction, it has been claimed. The substance, also known as nitrous oxide, was banned in the UK in 2023. Repeat users can be handed jail sentences of up to two years, with a punishment of up to 14 years for dealers. According to The Sun, the footballer in question was admitted to a medical centre after worried family members contacted his club. The same report says nitrous oxide canisters were found in a car in which the player was a passenger late last year, though it was not determined who the caniste…