<s>[INST] I use Meth and I smoke it I have been smoking for 3 years now and as of yesterday my chest has been feeling different.. I have a sharp pain when I take a deep breath and especially when I cough what could it be.. I will be 30 Monday 09/12 I Weight about 160 - 150. I have been fairly healthy. Hospitialized once in 2009 for pneumonia. [/INST] Hi thanks for contacting Chat Doctor.... According to your history possibility.......-Bronchitis or emphysema like chronic obstructive pulmonary disease-Diffuse fibrosis restrictive disease -pneumonia if fever there. Chest x-ray, auscultation and pulmonary function test useful for differentiating these. According to cause treatment might be needed with antibiotic, bronchodilator etc..... If no resp causes found then ECG or echo needed for cardiac cause. Take care. Chat Doctor.  </s>