Watching the show on hiding smoking the other day and i have a little tip that i use. People don’t realize, but if you have an oil furnace, there is actually an air intake used to draw air into the furnace then exhaust it through the roof pipe. but it is always drawing air. If you keep whatever you’re smoking right next to that pipe, it will draw in all the smoke. I was able to smoke in a house where people didn’t even smoke cigarettes for a lot of my younger years. You can identify this pipe by its little flap it has on it that you can adjust it more open or closed. If it isn’t sucking hard enough, turn up the heat for a second to get it to click the furnace on and it will suck like a bugger. Test the suction by lighting a lighter right at the flap and it should pull in the flame.