I smoke in my closet, snap from the bong, exhale through a tube. Leaning out your window works, and i do that in summer when the weather is nice.

i wouldnt smoke in the attic, eveyrone will hear, and im not sure its a good diea to make ahabit of purposely inhaling deeply around open fiberglass insulation....especuially fi you just stepped all over it and disturbed it!