I think everyone here should know that they have to realise the real reason why you want to quit in order to sincerely give up this bad habit.
It can be because it is harmful for you, because of religious reason or even to be a better person.
For me i have always wanted to quit because of religious reason. It is a sin. Other than that i also want to be a better person. I want to stop because i have been observing that i am not productive, not active and i always feel bad of the state i am in.
From now on, I am going to start a new page, and not lie to myself and not be in denial.
Go get a GYM membership, learn a new skill, do something good for yourself, occupy your life with the things god have created you for;appreciating yourself.
With that we all should not be demotivated and thing positive. When you relapse get back up and restart and dont think that you have failed but think that you suceed in overcoming the number of days.
No one said this would be easy. It took a long time for me to finally want to stop, so it will take some time to reboot too. Take it as losing weight there is no fast option or easy way out.
Learn and understand more about yourself. Get to know YOU.