Is applying Vicks VapoRub on the child's feet a safe and effective cure for cough and cold?

I am using BabyGanics ah-choo chest rub which is suitable to use from newborn onwards on my kids' chest and eet whenever they have congested nose. You can get it from http://sg.iherb.com/Nature-s-Baby-Organics-Ah-Choo-Chest-Rub-Eucalyptus-2-oz-56-7-g/16000 For me, it is just a relief of cold and congested nose and make kids sleep better. But it will not help to cure the cough and cold.