Recently quit smoking after 20 years of half-full pack a day. have chronic sinus congestion with thick/excessive mucus in throat. also have a dry cough occasionally and sometimes wheezing associated with laying down in bed mostly. recent normal pft?

Give it time: Congratulations on stopping smoking; you have greatly improved your chance of a long healthy life. You don't say what you mean by "recently". However, smokers cough and other consequences of smoking may take take months or years to improve after stopping. And it sounds like you might have an allergic component, i.e. asthma plus allergic sinusitis. Keep working with your doctor. Good luck!