I'm a 19 year old female and have been smoking on & off since I was 16, and nearly everyday for the last nine months. I recently had what I personally would call a marijuana "binge" and where I smoked all day for 2 days straight. After the 2nd day, I started to develop very slight pain in my chest. After this, I started coughing my ass off and hacking up tons of mucus. Could this be due to smoking? Should I be concerned and see a doctor? has this happened to anyone else before?