Gopinath Acharya das : There were a number of occasions when I was involved or sat in or was part of initiations, Srila Prabhupada always insisted that the doors and windows remain closed. Devotees would open the windows as if the smoke coming from the fire was a botheration. I don't know exactly why, but he would insist that we keep the doors and windows closed, it didn't matter, the smoke was not harmful.