Ok bro listen I do this every week, and not once have I even had any suspicion. Not to mention that I live in a moderately small house with 2 sisters, a father, and a stepmother. Just go into your bathroom, and turn the shower on as hot as it will go/close the door of corse. Wait about 5 minutes so that it will start to steam, and wait until the mirror in there is covered. Then just wip out the Jay or whatever else you plan on using, and stand up. It will be a little freaky because of the wierd feeling the water particles give you, but its all good. The water molecules attach onto the smoke particles and pretty much cancels them out. Theres no oder, and no risk of a smoke detector.