I worked for a quit smoking program for several years. Everyone is different for what works for them, but here are some things to try:

-get rid of all your cigarettes, lighters, ashtrays, or any reminders of smoking.
-clean out your car and wash all the curtains in the house to get rid of the smell.
-use something to keep your hands and mouth busy when you get an urge. If you're not sure what to try, here's a random list: squeeze a stress ball, hold a pen, chew gum, suck on hard candy or lollipops, blow bubbles, suck on or hold a straw, suck on a cinnamon stick.
-write down the times and places where you smoke each day for at least 3 days, then practice eliminating one cigarette at a time. For example, if you always smoke after meals, start doing something else in place of that cigarette.
-use certain tastes to help eliminate cravings, such as toothpaste, cinnamon, or citrus (I.e. brush your teeth, use a mouthwash or drink grapefruit juice).
-get a support system. Make sure you have at least one person you can call/text/message when you need a distraction.
-exercise! Studies show that even 10 min of walking is enough to reduce cravings.
-use distractions to take your mind off of the urge. Usually the strongest part of the urge/craving will last 5-10 min, so you only need a distraction that lasts that long.
-drink tons of water!
-practice taking deep breaths to relieve stress or cravings. Look up deep breathing techniques on Google; the ones that work for panic or anxiety usually work the best for cravings.
-there are a lot of medications that can help, like nicotine patches, gum, or lozenges (which you can get over the counter in the US) or prescription pills. Just make sure that you use the medication correctly, most people in our program didn't even read the instructions.

Good luck!