I suppose I should begin with a bit of background on myself. I am a college student, in good shape, neither over nor under weight, and have been smoking moderately (5-6 cigarettes a day) for about a year. I have recently begun to take note of my heart rate, and how fast it gets when I smoke. My resting rate is around 80-90 bpm, but see levels over 130 after I have had a smoke. This all seemed to occur, or at least when I began noticing it, when I tried weed and had an even more drastic increase in heart rate (around 160 bpm) and passed in and out of consciousness. Since then, though I do not smoke weed any longer, I have been paying attention to how my heart responds to substances such as nicotine. I have done some research, but cannot seem to find a concrete answer as to whether this is something I should be concerned with or not. I should also mention I have been having heart palpitations whether I smoke or not, as well as occasional chest pain and shortness of breath with a feeling of dizziness accompanying the latter symptoms. I do not know if these are related at all, but again just thought I would mention it. Any advise is much appreciated.