Left side chest pain ( non heart or lung related )?

Okay so for about 3-4 weeks the left side of my chest has been hurting with sharp pain (but some days it's absent). I went to the doctor i had a ecg, ekg chest x ray, blood and urine test. Doctor said my heart and lungs are normal and there is nothing life threating. The pain started when one day I was smoking some weed, and I had a bad trip ( I thought the weed was laced, so I went to the doctor clinic and had my urine taken). Nothing was in it,and ever since that day my left side has been hurting. (i've quit smoking weed since then) I'm also not sure if it's from working out (I go to the gym) or if it's from smoking.
Answer:

I had the same problem (minus the smoking part) and later discovered (just by pure luck I guess) that the reason I have chest pain is because I have sleep apnea (which was not common for someone of my age, gender, body weight, etc) and that while i was asleep I would wake up (not realizing I was awake) and gasp for air. the gasping caused muscle straining which triggered that sharp pains. I'm not saying you might have sleep apnea but since you do work out..and if you were coughing there is a strong possibility that you just straining the muscles in your chest in which case a doctor can give anti-inflammatory if they deem it appropriate and you symptoms are severe enough

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