I quit 2 years ago and I never felt better. I know it sounds strange but I read a book and I it was easy to quit. I strongly encourage everyone to do so because they can but they dont know that.
Strong will is key for eveyrhing. not every person have that type of character
Strong will is key to majority of the things and this helps a lot in the bad times as well. Whenever you are down or adducted the willpower determines your next step if it would be in right direction or will continue to it. That is the reason many times you stop it for a while and then continue back as cannot sustain for longer.