Introduction Nowadays, the vast majority of people consume caffeinated beverages daily. Believe it or not, but by drinking a regular cup of coffee, tea, or a can of Coke, people are taking one of the most widespread in the world drugs. Levinthal (2014) notes that although caffeine is one of the psychoactive drugs, “among the range of psychoactive stimulants existing, caffeine is considerably weaker than most, and research suggests that caffeine consumption is relatively benign” (p. 276). Therefore, there is no need to overreact and stop drinking a morning coffee. However, it is a good reason to delve deeper into the issue and find out about some necessary precautions. This paper aims at studying caffeine, its modern forms, and its effects by analyzing a personal experience connected with the consumption of this “light” drug. Main body To begin with, it is impossible to deny that most people consume some amount of caffeine one way or another. For instance, it can be a coffee or tea in the morning, a piece of chocolate in a tea break, some Coke for lunch, and so on. Since everybody has an utterly different body and everybody’s inner systems work diversely, the quantity of caffeine needed in each case and, consequently, its influence varies considerably. Researchers note that “the metabolism, clearance, and pharmacokinetics of caffeine is affected by many factors such as age, sex and hormones, liver disease, obesity, smoking, and diet” (Nehlig, 2018, p. 388). One more significant factor is claimed to be the interaction of caffeine with various medicines. Some people may experience strong effects of caffeinated products while others will feel no difference between their state before and after consumption. Considering all this, it is possible to note that in every particular situation with different people, consumption, resulted in addiction, side effects, and so on will be drastically contrasting. One more essential factor to consider is the tolerance towards behavioral, physical, and psychological effects of caffeine that is claimed to occur throughout consumption. According to Levinthal (2014), although caffeine tolerance is hard to evaluate, scientists claim that tolerance effects start to appear for utterly low dosages, such as equal one or two cups of coffee. It is possible to note that, in the case of tolerance, the situation is somewhat similar to the consumption in general. In other words, for every particular person, the tolerance and the moment in that it occurs will vary remarkably. The same situation can be observed in terms of differences in response to caffeine intake among people with various habitual consumption. Researchers note that “low, moderate, and high consumers show similar absolute and relative improvements in exercise performance” (Gonçalves et al., 2017, p. 217). It proves that caffeine intake does not influence physical performance to a great extent. The main point here is that it does not make it worse, and no negative consequences are discovered. Conversely, the consumption results in some minor improvements without dependence on the habitual intake. Although tolerance towards caffeine consumption is not a considerable problem, there is one more essential point – withdrawal. It is one of the primary reasons why caffeine is considered to be a drug. In this case, with