DEAR DR. ROACH: I decided to practice using an inhalation spirometer, partly because I have a daily productive cough (small amounts three to four times a day). I smoked a pack of filtered cigarettes a day from ages 17-29. I smoke marijuana now. My scoliosis is quite complex and has taken over 4 inches off my height. But at age 75, I volunteer as a stable hand for 6-8 hours a week, and they say...
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