I quit smoking 30 years ago using the LifeSign QuitKey Smoking Cessation Computer, which you can buy on Amazon for $40. You need to follow the directions exactly even if they seem silly to you, they serve a purpose. The product uses a multi-disciplinary approach to stop smoking. Smoking is a drug, a habit, a crutch, and more. The first important thing the program does is to break the association between wanting a cigarette and smoking. Instead you will learn to smoke when the buzzer goes off. This is Pavlovian! (You need buy-in from work.) The second thing the program does is to gradually reduce your dependence on nicotine. This is physiological. The third thing the program does is to have you list all the reasons you want to stop smoking. You read those reasons when you have the urge to smoke before the bell. I used to smoke 2-3 packs a day. I quit cold-turkey when I was down to 4 cigarettes a day. I did as they suggested and spent the day at the movies where you can't smoke.