Look at this short video. Seriously, watch this video. It'll only take about 4 seconds:
Watching lungs inflate outside of a human body is cool. But seeing how smoking REALLY impacts lung function is cooler.
This is a great video to show students in an A&P class or to use in a project regarding the respiratory system. The original link can be found here: https://vine.co/v/hjzA0whiMVu