I have been in a constant cycle of quit/relapse/quit/relapse for such a long time and it's exhausting. 

If you are in that relapse cycle too and really want to quit, educate yourself properly by watching the Joel Spitzer videos on this forum, head over to the WhyQuit website to watch even more and spend lots of time here for support, encouragement and distraction.

A good starting point if you are planning to quit is on the link below. 

https://whyquit.com/joel/dayzero.htm