My partner tried everything to give up smoking;

I nagged at him for 6 years.  He didn't give up. 

He smoked 40 a day for 10 years.  He tried hypnotherapy.  He didn't give up. 

He tried nicotine patches.  He didn't give up. 

He tried disgusting tasting gum.  He didn't give up. 

Then we went to a family party and his gran who had smoked for 60 years (whose husband had died from smoking related lung cancer) said she read a book and gave up "just like that".  He read the book... AND GAVE UP!