I am 20, 54-55kg, and i have been having normal blood pressure (70/120) and a hightened heart rate- NOT above 100, but I feel it a bit heightened, it is like 80 or 90 something.. I have read some reviews on the topic, and as far as i understood, for adults having a heart rate below 100 is quite normal. still i am a bit worried cause my heart rate used to be slower... I am aware that there are a couple of factors that might be the reason: I am a smoker(trying to quit now!), recently i started drinking coffee again, mainly cause i had a stressful exam period and needed to stay awake and concentrate,..oh and i am an infrequent coke user. I used to excerize and swim, but lately haven't had the time. I am aware that all those factors might be a reason, but is it permanently gonna stay like it is now? I had medical check-ups last week, including blood tests and everything seemed fine, actually, my results were perfect!! this summer I had my first ECG, not because i had problems, it was just a routine check, and everything was fine, but i remember my pulse was like 73 back then, and now it is like 80 something.. I know i should start leading a calmer and more active way of life, and i am trying, but can someone please answer my questions and recommend me a way to feel calmer and healthier in this situation?? I worry a lot, and have been having problems sleeping, tried some herbal pills to calm me down, but they don;t seem to be having that much of an effect.. please help..:(