I love how in movies teenagers are sometimes gonna be sitting in their room smoking a freakin joint right on the bed, and then usually a parent knocks on the door, and the kids are like waving their hands into the air, dispersing the smoke, as if that makes the smell of a joint go away. Then the parent usually comes in and is like totally oblivious, like - "You kids behave, ok?". My guess is probably in those movies the adults are so fucking high themselves they just don't notice. The only film that got that right was Detroit: Rock City, where the kids are spraying the basement where they have been smoking with several cans of air freshener. You don't make ganja smell disappear with waving a freakin' hand into the air, what's wrong with you!