A man with learning difficulties said he smoked cannabis to calm him down.
Stuart Anthony Frankish, 27, of Nottingham Road, Sedgebrook, admitted possessing a quantity of cannabis on February 24.
Prosecuting, Daniel Paulson told the court that Frankish had been arrested in Grantham in connection with the alleged theft of meat from Marks & Spencer.
He was taken to Grantham Police Station where officers found cannabis on him during a search.
Mr Paulson said it was a small amount of the class B drug which was for his own use. He told the court that Frankish had a previous criminal record, including some relating to drugs. His last conviction was for possession of amphetamines in 2014.
Defending, Sonia Bhalla said the drug was a small amount for his own use. Miss Bhalla said it was worth about £10.
She added: “He would like me to convey his most sincerest apologies to the court. He resides with his parents and has learning difficulties. He uses cannabis to calm him down. He has taken steps to go to his GP and receive treatment to help him withdraw from it.”
Magistrates fined Frankish £80 and ordered him to pay £85 costs and a victim surcharge of £20.
They also ordered the drugs to be forfeited and destroyed.