I have some medical issues that varry. I do smoke marijuana, that is the only thing i smoke. My lungs as of recent have been fine, here or there they would hurt from me smoking too much and i would have to take it easy. Now these last few months, Ive been throwing up out of my lungs somehow, some sort of clear Gooy-spit thats sometimes completely bubbly or sometimes clear. I cough non stop throughout the day, even when i do not smoke. Im not sure if i have an infection or what and seeking advice.. I know your advice will be to stop smoking, but even when i do for a while the coughing never ceases. Ive also been having pain in my left lung when i cough. On rare occasions blood will be in the phlem.