How can i make myself stop?

I am now concerned with how my body looked like. I dont look healthy, but im not malnourished neither slim. It’s just, im not satisfied with how my body looks. For sure, for peolpe of my age, they will be healthier. Until I came down to the reason why my body is dropping all these years. Because of my smoking. Most of the people who knows me before i started working which was the time i seriously started smoking, (i mean it started in college when im at my junior year but its not that serious) where i can consume 1 pack of 20’s or more in a day, they will laugh at me and say “Adik ka noh?”. Even my mother asked me if im taking drugs. Hell NO. Now, i am thinking of quitting this. I dont know how to start. How can you let go of somethign that you’ve been seriously doing for the past 4 years. I did my research and according to the articles i have read is that quitting smoking is just easy. 

• Its a mind game which can be difficult at time. All you need to do is to make yourself busy so that you dont think of smoking to pass time by. 
• Associate yourself with people who doesnt smoke.
•  Be motivated, think of something that would make you want to stop smoking

Those were some of the numerous things to start with on how i can stop it. But then, everytime i am starting it, i just fail. I really cant help it. Many times i told and control myself not to smoke, but i still didnt.  I dont know how will i do it. But then my father, who was a chain smoker was able to stop it because of  fear, fear that he might have the same case why my grandmother died, because of smoking. I also applied this thought for me stop smoking, but often times i tried to scare myself, i just dont. Somewhere inside me will say, ”bata ka pa at malayo pa mangyari sa yo yung nangyari sa lola mo“. It just feels like i have a bad conscience, instead of telling me to stop, its allowing me to enjoy and to give in. Im giving myself a deadline that this should stop this year or else, i just dont know.