Cigarette addiction problem

Title,

Grade 12, I initially thought that smoking might make me study more efficiently for some reason, but after smoking for a year, I found that I couldn't stop myself. In addition to the high price (I mainly smoke Belmont cigarettes), I had to smoke a cigarette every 50 minutes to keep calm. Sometimes I might sneak out of school to smoke in the name of going to the bathroom during consecutive classes, but I know that the final exam time is very long, and the 12th grade course is very important. I don't want to cause any problems in my next semester. It is difficult for me to get rid of the addiction in the middle, and I also know that smoking will definitely cause health problems, especially from a young age. I want to know if anyone has the same experience as me. How do you quit smoking?

As far as I know, nicotine gum is prohibited from being sold to minors. How to quit smoke without it?