I am traveling from heathrow in a couple of weeks, my friend is also flying on an earlier flight and has CCR access so I was going to go early to meet be able to access the concord room his flight is at 2 and mine at 4. I was wondering if there was anywhere past security to smoke before my flight. Or can you go back through security to the check in area and then back through security again? Do boarder agents have an issue? I assume im not the first to ask, but also people who may have left things in cars needing to go back etc.