This number has called my cell 4 times in the last week.  They claim to be from the CDC and performing a survey on smoking.  Today they called again and I spoke with a real person, who again claimed to be with the CDC, performing a survey.  I asked what CDC stands for, and she said "Center for Disease Control".  I said that the CDC is a federal agency and calling my cell phone; that is very unusual.  Also told her I did not believe she is from the CDC.  She said I could opt out of the survey, and I told her I wanted them to stop calling my cell phone.  She hung up.  

When I Googled the phone number I got FORCS Study at 490 Fleet St in Rockville, MD, but nothing mentioned about the CDC.  I wonder why they feel it necessary to misrepresent themselves.  I smell a telemarketer scam.

These people are telling me (and others) that they are from the Center for Disease Control.  They are not.

I asked them to stop calling me. They have not.

They are telling me the same thing... And they wont quit calling!

They've called my mobile twice in the last two days.   I was suspicious of their claim they are with the CDC. They wanted me to take a survey lasting 25-30 minutes.

This is the second call I received from this number.  I didn't answer either.  However, they left a message on their first call that said they were from the CDC and conducting a survey on tobacco smoking from random cell numbers, AND will call back another time.

I think this is most likely a SCAM because they didn't give their name or phone number.

Recommend you don't answer and just hang-up!