Make sure you talk to your family and let them know that, even though they are not smokers, they may have to make a few adjustments to cope with your aggitation. Come up with a physical sign to show when you're nic-fitting so they know to either give you support or give you a little space and time to allow your nic-fit to pass. I've been affraid of the same thing for a long time, but your family wants you to quit smoking as much if not more than you do.