Mr Yue Tuck Choy had gone down to buy some food at a coffee shop with his friend to celebrate his birthday on May 25 last year.
At the coffee shop, he saw a smoker, 59 year-old Tay Thiam Huat, smoking openly in a non-smoking area.
After initial attempts to persuade Tay to stop smoking failed, he took a photo of Tay and threatened to send the photo to the police.
Tay then grabbed Mr Yue by the shirt, forcing Mr Yue to push Tay away to the ground in defense. The two men shook hands and seemed to make peace after passersby separated the two men.
Minutes later, Tay returned with a 31CM knife and stabbed Mr Yue in the back suddenly, narrowly missing his right kidney.
Mr Yue said: “I didn’t think he would come back and attack me. All I felt was a rush of wind from behind me and then a sudden, sharp pain in my back.
“I thought I was going to die.”
Mr Yue’s friend managed to disarm Tay after a short struggle and both men gave chase to Tay for a short distance, but Mr Yue had to stop as he was feeling weak from his injuries.
At the National University Hospital, Mr Yue had stitches for the open wound on his back.
Tay surrendered at the Choa Chu Kang Neighbourhood Police Centre the next day.
Yesterday, Tay was charged in court for voluntarily causing hurt to Mr Yue. He was jailed for 8 months.