Is there anybody who is smoking cigarettes during his preparation?

My syllabus is almost completed, and I am getting 180-210 in my mocks . But due to the stress, my friends introduce me with smoking cigarettes, and now I am smoking around 4-5 Chhoti Advance per day . Although the friend who introduced me to this smoking habit has already left smoking two months ago, and I am doing it for around 5 to 6 months. Is there anybody who has same condition as me please help how to get rid of this?