I've known a few people with extremely mild CF, and many of them either still live in the land or denial or used to. Even if someone has mild CF, it's vastly important to treat your disease care wise just like someone with a severe case of it does. Always do your meds, aerosols, and even an occasional vest clearance therapy just to make sure nothings there. BTW this wasn't directed at anyone in this thread, the last response got me thinking about some cfs I knew way back when who were mild and acted like they were normal people.