THC is a super bronchodialator! Better than albuteral, if you ask me. The key is to only smoke the good stuff, that contains the most THC, and only take a few tiny hits as to not irritate your lungs. Google, "marajuana and THC." If you ever want to get out of a coughing fit, take a hit, you'll stop. I don't smoke on a regular basis, at all, but I can tell you that when I have, there is a huge difference in how clear I feel. I also have an O2 meter that I have experimented with, while smoking. Before a couple hits, my O2 is 95-96. After, 99 and I can feel it. Eating brownies will not make you feel clear, the exact opposite actually. Brownies are hard to figure out the correct amount of weed and are hard to duplicate. An overdose of THC will make you feel EXTREMELY tight & short of breathe, which is a side affect of an overdose. I wouldn't recommend smoking often, but a couple tiny hits, as long as it doesn't irritate your lungs, I don't feel is going to hurt.