I've been an occasional smoker on & off for the past few years but a regular one for the past 1 year. Lately I've started experiencing issues with my health. Although I'm actively trying to quit the habit, I'm still worried if my health has deteriorated beyond repair. Could you suggest which doctor to go to for these symptoms? - experiencing a fast heartbeat or ( I'm hyper focused on my heartbeat even when im at rest) - a sore throat - feeling a throbbing in my thighs for a few days now. - shortness of breath sometimes - chest gets heavy after smoking. - a general feeling of fatigue I want to quit but worry about the withdrawal symptoms.