from what i heard for some people doob tubes work and some people say they got caught because of them so i wouldnt use just that, light an insence while your smokeing and put a towel over the crack under the door and over the vents that suck air out of the room back into the rest of the house, and blow the smoke out the window and then air your room out after you put out the insence, always works for me

nag champa and patchouli work good