I hold an irregular heart rhythm?

My heart will beat normally 5-10 beats, than it pause and comes back with a very not easy THUMP. It gives me a weird rush in my brain, as if I'm suddenly getting a rush of oxygen (which sounds correct if you ask me)
on 0.75-1 mg of Xanax a light of day, I eat very healthy, I don't consume artificial sweetners etc. I hold a job that is pretty physically strenuous. I smoke about 10 cigarettes a light of day.

Is this something I need to worry about?
Answers:     i wouldnt be smoking if i were u that for sure
Sounds like a premature heart beat.

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