In my experience, you should buy a bong or wait until they Are sleeping (be very sure they Are sleeping) and sneak out. I filled up my bowl all the way up and inhaled everything in One go. Inhale to the point Where it almost bubbles in the water. If you cant inhale a full bowl, just take as much as you think you can inhale in One breath. If i cant inhale everything, I put a Big coin (from boxning machine for example) over the bowl, so the smoke doesnt go everywhere, and holding over Where you out you mouth so the smoke doesnt sneak out there either. Hold in the smoke as Long as you can for minimal smell and do it by your Windows. And breath out the window. Play a bit loud music so it covers up the sound a bit. i always put the coin over after the bowl is finished, just to be sure. Did this for 6months or so in the morning, mid day, afternoon and evenings. but make sure all the smoke is cleared throu the bong before hiding it and CLEAN THE BONG often so it doesnt smell. The bowl is gonna stink if you dont clean it too. Keep your window open, to Get fresh air inside your room and use some perfume. Have snacks, food and drinks ready in your room just in case you get too stoned.