I can easily see cracking those old boeing doors open enough to vent unpressurized, the first action of the door handle is to open vent panels on top and bottom. Talking about smoke, on the DC/MD it used to be easy to shove a plastic spoon in the door seal if one of the crew did not like cigarette smoke, it would completely evacuate cigarette smoke if done right. A new horse handler or a person hitching a ride as our customer would get wide in the eyes seeing a crack of daylight shine through, good fun.