Please help me to leave this habit 🙏

My syllabus is almost completed, and I am also doing well in my mock test like getting 180 to 220 marks. But from last six month, I have started smoking, and some friends introduced me to it . Initially, I was smoking once in a week, but now it’s like I smoke 4 to 5 per day . I want to leave this habit, but I cannot control it. Please help me to get rid of this.