It's rude to smoke indoors when other people are present.
Josh just got home from a long day at work with a pack of cigarettes in his pocket and his roommate hanging out.
Josh wants to relax.
Josh decides to step out onto the porch to have a quick smoke.
Josh goes to his room and relaxes at the computer, lighting up a cigarette.
Josh's roommate appreciates him being considerate in his choice of smoking location.
Josh's roommate yells at him to smoke outside because the smell is disgusting.