Hello everyone just made this account to ask for opinions, I’m 19 and I smoked for 2/3 years but have stopped now around November I started getting an ache on the left side of my chest if would last a few seconds and then go and this would happen on and off a few times a day, I’m a very paranoid person so my first thought was cancer I pushed it to the back of my head for a bit but ended going to the doctors and they said my chest sounded clear and sent me for a chest x ray which came back clear too anyway a few months on and this is still happening it’s an on and off pain and it’s jusr beside my middle chest bone on the left side I do have a smokers cough kind of but only when I make myself cough my phlegm has tiny brown dots in it which when I look at them close are more like dark green I have no pains breathing In laughing etc I went to the go last week again and they said my chest sounded fine could this be anything else or could it be cancer