How to quit smoking completely if i smoke only one or two Cigarettes a day?

I have been smoking for 10 months and i used to smoke around 5 Cigarettes a day……Now my Fiance seriously wants me to quit smoking completely….I didn’t smoked for one whole week but then again i started smoking one or two cigarettes. Whenever i get up after sleep or sit where my friends are smoking. I feel like smoking. Please tell me how can i quit it completely….!!!!