Really sad that you would take the time to give them bogus information. There are a lot of legit organizations out there that do this kind of work on a professional level. This is not telemarketing, it is research, and something like this is used to help improve health programs and health education across the country, not to mention right in your own community/area. It can also help states, and individual counties receive additional funding from the federal government if these types of health matters are predominate in your area. Why not help your state or county get additional funding they may deserve. Perhaps if you have Chronic Obstructive Pulmonary Disease like myself, you would have felt differently about answering a few questions.
Take a look at Chuck in SF post. Offering money to drop COPD meds and participate in a study. Can sure sound like a scam. However, I'm not writing this off as being legit or a scam. This is why people need to do their research with calls like this. Ask for state and or federal web sites, their toll free number, supervisor, and where you can find more information out about what is going on IF you want to take the time. I agree, there are legit organizations out there trying to collect health information for improving health programs and health education in local communities. If it's going to help me, my children, or friends, then I more than likely participate in a survey, but not some clinical trial.
As far as the Do Not Call List. This does apply to telemarketers and they are required to follow federal guidelines. When they don't, they are subject to penalty from the FCC. When it is a legit organization in relationship to surveys, they fall under a different category than telemarketers.