In place of smoking cigarettes, try sunflower seeds, sugar-free lollipops, or gum, or carrot or celery sticks if youre concerned about weight gain. You can also switch your cigarette habit for a nut habit, and eat four nuts in their shell for every cigarette you want to smoke. This way, youre using your hands and your mouth, getting the same physical and oral sensations you get from smoking.
Thus, many achieve success in quitting smoking. Many of my acquaintances bought sweets or what they liked, and when they were ready to smoke they ate sweets. But most importantly, you need to want and keep this position until the end. In the end, it's just a habit, and you'll remember it in the coming months (with food, work, etc.). And, of course, do not listen to the surrounding smokers who do not support your decision. Good luck!