I stopped 20 years ago Heinz from 40 a day and the only way that worked for me was instant stop, your food taste is enhanced and keeping the weight off becomes a little bit of a struggle. Good Luck.
The major side effect is you become totally intolerant of anyone smoking around you in a public area

The best bit of news about giving up is that after seven years I was told your body is about back to normal which I found very encouraging.