I normally light an incense stick in my balcony. I used to keep it at the window sill. Everything is ok but the ashes fall in the sills and mom labors to clean it on the weekend. One more problem was that due to some scientific explanation of air flow and Einstein might know why the smoke keeps flowing outside.
Since i had to do something about the ashes, i changed the window which i would attkao it from the one closest to me to the one which is closest to the grill and i made it point outside. This way 90% of the ashes are outside and mom won’t have to worry about the sill getting dirty.
One more interesting thing happened. the smoke started blowing in. Life is good.