Honestly, dude, I would invest in a cheap metal bowl or a small glass one, ya know? With a bowl, its much easier because you can put something over the bowl when you've taken a hit to extinguish it and make sure that no smoke escape leading to a smell, and then just use a doob tube. A doob tube is a towel paper roll or half a paper towel roll, then you stuff downy sheets inside of it, and the on one end of it then put a rubber band around it to hold them on there, then you just blow out and the smoke smells like downy sheets instead of pot. I smoke entire bowls with my mom just 20 feet away in the other room without her noticing a smell or anything, then again...I blow the smoke through a fan that's facing the window, soo....

Since you're using joints, I'm not sure what to tell you really...=( Joints always stink, even if you do it in the garage and blow it out the window. If they decide to get up one night because they're thirsty or something, and they go anywwhere near the garage door, they'll smell it.