Hi not sure if anyone will know this but worth a try,
i have smoked for 41 years mostly roll ups with no filters or anything, but about 3 plus years ago i started putting filters in and after a few months started coughing up green phlegm i asked the doctor he just said getting older and smoking,
Some days it seems worse than others its really strange, i don't smoke load about 15 a day but there dead thin and i only smoke half at a time.
Someone said my body got use to smoking without filters and i have its messed it all up putting filters in.