After 15 years of smoking life, i quit smoking. Its really easy. Its just your will power.

There are myths with smoker's over quit smoking.

Myths:
Many people think that they may face health issue if they stop smoking which is wrong
Digestion issue- wrong again
Feeling Sleepy - a bit true but can overcome in 10 - 15 days
Hearbeat uneven- not true.
......
There are many iphone Andriod apps which can guide you how to quit smoking easily....

Best of luck....