well, dont smoke joints or blunts if youre smoking inside, use a bowl, and while smoking cover the top of the bowl with a quarter or something so smoke doesnt escape, and try to "ghost" your hits as best as possible(you will also get higher)
I've used products like "Ozium" and "Orange Chronic" b4 and personally I like ozium.
umm you could also try the empty toilet paper roll stuffed with dryer sheets.