It's not your lungs cleaning the mess because you continue to put smoke in them. The cilia doesn't even begin to regenerate until three to four weeks after you quit putting smoke in them. Vaping will do as much or more damage as well.
As far as Brown mucas, that's definitely worth a Dr visit because you could have a lung infection and if you get sick and have a lung infection on top of that it will not be good.... Just saying..
Anyway, we love to have new members but we're a quit smoking site so if you're looking for support to continue killing yourself with cigarettes or vape you've probably come to the wrong place.
Hopefully you'll decide to take your life back and quit all of it and take your seat on the train 😊