phatte, i didn't mean pranayama when i said yoga, i actually meant the cleansing yoga which is called neti try it , however it might be very difficult or even disgusting for some people to do it. if you need details email me i 'll send you details. i practice it almost regularly. i didn't get cough or cold for almost seven or eight years, however i became lazy and became careless i got flu a month ago, now i'm taking it seriously again