Heart rate under 60?

I'm 25 years old, I´ve always had a heart rate at rest of 60 to 65, I did alot of sports when I was younger, recently my heart rate has gone to 50 to 55, Every time I feel my heart rate at rest I feel it's under 60, I'm a light smoker 2or 3 a day, I do exercise 3 or 4  times a week and I always feel normal when I do exercise. The only symthom I haveis that im really conscious about my breathing. Should I visit the doctor and get this checked out, or is it all in my head?

[CCF HeartMD5]

For a young, relatively healthy individual, a heart rate in the 50's may not be abnormal. If you are having no symptoms, there is likely nothing that needs to be done. Conditioned athletes often have very slow heart rates, since their heart muscle is extremely efficient at pumping large volumes of blood, and their organs are also very efficient at extracting oxygen from circulating blood.