Consuming tobacco, i.e. smoking is considered to be one of the most serious addictions nowadays, as well as one of the leading causes of mortality. Tobacco smoke contains more than 4 000 chemicals, among which the most dangerous are nicotine, tar and carbon monoxide. Although all of the smoke chemicals have effect on people to an extent, nicotine is considered to be the primary substance responsible for causing pharmacological reactions, especially addiction. Many countries have recognized smoking as a serious and dangerous health problem and main factor that contributes to mortality rate due to the wide range of diseases that it causes. The adolescents are likely to try out new thing and are prone to experiment with various addictive substances, smoking included. In order to raise awareness and prevent side effects caused by smoking, targeted groups need to be constantly educated. According to the conducted research on the side effects of smoking, the number of smokers is not dropping down to an expected rate. This thesis explores the frequency of smoking among the adolescents, distribution of smoking rate among females and males and side effects of smoking. The research carried out for this thesis included 131 participants, all aged between 13 and 25 years. The responses were collected through the questionnaire filled by the participants. The results revealed that 45% of participants declare themselves as smokers. Among those 45%, 54.2% participants said they started smoking when in high school which is the most critical period of the adolescence. Although the participants revealed that they are aware of smoking side effects (the one affecting themselves, as well those affecting their surroundings) and that they plan to quit in the future, many of the participants do not see themselves as addicts and do not think of smoking as a problem.