He started smoking the drug in 2007 but said his addiction intensified in 2010.
Last year, the man started experimenting with injecting the drug directly into his veins after a friend introduced him to this method of getting high.
"They call it 'battery to coil' because it hits the blood straight and gives you an instant high," he said.
The former electrician lost his job after he started stealing lights from his workplace and sold them on the streets to feed his addiction.
He said he was also worried that he was setting a bad example for his six-year-old son.
"I told myself that I'm gonna leave this thing when I get out of here. I want help because I don't want my son to end up like me," he said.
Two other addicts were also present in the ward but they declined an interview.