Introduction: Over the past few years there has been a significant increase in consumption of caffeinated beverages,especially among children and adolescents. This trend is worrisome, and numerous studies point to the negative impact of excess supply of caffeine on various aspects of human functioning. In order to analyse this problem a proper study was conducted which aim was to assess the problem of addiction to caffeine among adolescents and young adults with particular emphasis on the characteristics of people declaring frequent consumption of soft beverages. Material and methods: Based on the review of literature about caffeinism authors constructed a questionnaire survey and identified the following inclusion criteria: 1) declaration of consuming soft beverages, 2) age 13-30 years. Diagnostic survey was conducted on a group of 118 people. Demographic variables were also controlled. Results: The most frequently declared potential symptoms of caffeinism were: headache, irritability and explosiveness, sleep problems, insomnia, palpitations and accelerated heartbeat, but these results differed within age groups. Conclusions: Excessive intake of soda products and exposure to high doses of caffeine can be an important environmental factor in the formation and maintezawierająnance of chronic diseases and addictions, also can be associated with poor dietary behaviours. Therefore it is important to prevent and rise awareness of children, adolescents and their parents about the dangers of excessive supply of products containing caffeine as well as further research on the effects of caffeine on the psychophysical functioning in this age group.