There are no easy ways to quit smoking but the best is to go cold turkey. Trying to taper down is more difficult and rarely successful. Gum containing nicotine can help you through the drug withdrawal phase. It tastes better if you chew it with mint flavored sugarless gum. Follow the directions on the package.
Some people find the nicotine patches helpful.
Only the first couple of days will be difficult. During that time do whatever you need to do. Choose a large number of different things that keep your hands and mouth occupied. This includes gum, candy, mints, nuts, fruits and vegetables. One guy took a baby pacifier to his job.