<s>[INST] i am unable to complete any strenuous taskslast month I gave up smoking. ever since I have actually felt much weaker and my heart rate keeps going up; and I cant seem to do tasks like run, carry things or even have sex I get exhausted and my heart rate is getting higher thanks in advance [/INST] HI, thanks for using Chat Doctor Congrats on smoking cessation. The smoking cessation significantly reduces the risk of heart disease, stroke, cancer. Cessation is not normally associated with weakness and increased heart rate. There is likely another because that needs to be explored via physical examination and blood tests. Blood tests would include a full blood count to rule out anemia and thyroid disease to check for low levels. May also need heart evaluation as well-ECG, echo hope this helps </s>