Police pulled over a man in Sankt Augustin Way, Grantham and found he had £200 worth of cannabis in his car.
Lee Gray, 29, was stopped at around 8pm on April 2 and officers immediately noticed the smell of cananbis.
After searching the car the officers found a bag of cannabis in the glove compartment. Gray was arrested and the drugs were valued at £200 by a police drugs testing officer.
Tracey Ross, prosecuting, said: “He was interviewed and fully admitted the offence. He said the drugs belonged to him and were for his own personal use.
“He said he buys in bulk because it is cheaper.”
The court hear Gray, of Burghley Street, Bourne, has been using cannabis off and on for the past 14 years.
Rob Arthur, defending, said: “This was effectively a month’s worth of cannabis for the defendant. At the time he was working for Bourne Textiles.
“He paid the money and purchased the cannabis because obviously it’s cheaper to buy in bulk.”
Mr Arthur told the court Gray has since lost his job.
Gray was fined £70 and must also pay £85 in costs and a £20 surcharge. Magistrates also ordered the forfeiture and destruction of the drugs.