Sploofs work, but if your as paranoid as I am what I do to smoke in my parents house and dorm without anyone knowing is:

Before I take my shower in the morning I'll have a sploof, then I'll have a hot shower running with the steam coming and my bathroom window open. I smoke blunts too and I haven't been caught yet. Even in the bathroom at my dorm that has no window, no one can ever tell. I mean just take a shower before you go to bed and do that.

But yeh sploofs do work in my personal experience. Even on their own with no shower, my parents couldn't smell it.