This morning my wife found this note stuck to our front door. When she called the number,she was told that either herself or myself answrted a phone survey about smoking in the house. She asked the person on the phone what number they called .The reply was well we called your house phone .....my wife replied we dont have a house phone we have cell phones....oh they replied ...well we have a free gift for you if youll just allow us to come in and demonstrate our air purifier .......we said no three times and they persisted......my only worry is someone getting taken in by this ploy...Noone in the house took a survey and they didnt call us ......so not being honest with me how legitimate is this really becareful folks