Let’s not forget that Han and Leia simply walked out into the cave/slug-stomach. No airlock, they just lowered the ramp and simply strolled out, all while wearing no more protection than this.
I’m surprised that people still argue over physics in SW. These films have broken the laws of physics for the sake of entertainment since the first film. Not to mention that Lucas, and especially Kershner, were quite adamant about SW being fantasy and not true sci-fi.