I am a 32 year old female 5ft 9in and 155 pounds, I have expierienced periodic shortness of breath sometimes accompanied with a feeling of my heart skipping beats. This has happened about 4 times over the past 2 months. I am a light smoker, half a pack a day or less.
Thanks for your question on Chat Doctor. I can understand your concern. Since you are smoker, we should rule out heart (arrhythmia) and lung (bronchitis) related diseases first as both are common in smokers. So consult doctor and get done 1. ECG, 2d echo and Holder monitoring (24 hours continuous recording of ECG) to rule out arrhythmia and other heart diseases. 2. Clinical examination of respiratory system and PFT (pulmonary function test) to rule out bronchitis. You may need anti arrhythmia Chat Doctor.  In any case, smoking cessation should be done as soon as possible. Hope I have solved your query. I will be happy to help you further. Wish you good health. Thanks.