Trigger Avoidance
For everyone who smokes, there are certain triggers that cause you to crave cigarettes more than you would in most situations. For some people, that trigger is a stressful situation. For others, they simply have a set time and place where they smoke, perhaps when they are on break from work or when they are talking on the phone.
As you quit smoking, these triggers will become even more powerful at creating cravings. If you want to stop yourself form giving in to the cravings, you need to ensure that the triggers never activate. So that means actively avoiding situations that make you feel like you need a cigarette. And if you are used to having a cigarette during something you do every day, then occupy yourself otherwise during those times.
If you would normally smoke while on the phone, then keep a pen and paper handy to just doodle and scribble while you talk. If you would smoke on your lunch break, then do something to keep yourself engaged and distracted from smoking during that time.