Nicotine from cigarettes is an addictive substance that causes addiction in the brain. Heavy smokers often experience withdrawal symptoms.The decision to quit smoking is difficult. The brain is used to an addictive substance, and in addition, everyday activities such as a walk, a break at work, drinking coffee, traveling by car, sitting in the evening and many others are connected with smoking.Quitting smoking requires strong will, determination and strong motivation.The goal of the SmokeFree application is support and help during the most difficult first 21 days of quitting.When a smoker lasts 21 days without a cigarette, he has passed the first most difficult period and is on the best way to quit smoking forever.The app works as a quit calendar. It accompanies the smoker for 21 days on his journey.It contains a calendar with various information, tips and tasks that motivate the smoker and give him feedback on how he is doing.The application offers the possibility to create your own diary with notes.Quitting smoking brings several positive changes.Without smoking and cigarette smoke, you will have more energy and the body will receive more oxygen.Without smoking and cigarette smoke, your breathing and lung capacity will improve.Without smoking and cigarette smoke, you will have less stress. You will get rid of the constant urge to light a cigarette.Without smoking and cigarette smoke, the quality of your life and overall health will improve.Without smoking and cigarette smoke, your fertility and chances of having a baby will improve.