I was having the exact same problem with blowing smoke ut the window; the smoke would always blow back in by some gust of wind. now that it's winter i the US, i've been smokng in my room more often. whtworks for me is to find a small fan, bout a foot wide, turn it on high(no pun intended) and stick it on your window sill with the window open(try not to let it fall out) then i take 2 large books and cover the remaining open half of the window which makes it so all the air is going outside. be sre to keep the bowl or j close to the fan so the smoke commin from the weed goes out also. thats all ive been doin and has been very effective wt the smell. Also, a window with a screen worksbetter in preventing anyhing from falling out. hope it wk out. give ita try sm time when u dnt have to worry so u get the system dwn.

PEACE