Smoking Causes COPD, Emphysema, Lung Cancer This 3D medical animation is part of an anti-smoking campaign, showing how smoking causes normal alveolar sacs to become enlarged and thinned over time from emphysema. Because the alveoli cannot contract, air is trapped in the lungs and the smoker cannot breathe out effectively. Nucleus Medical Art is a leading creator and licensor of medical rnillustrations, 3D medical animations and interactive multimedia for rnmedical devices, pharmaceutical companies, education, biotechnology, rnmarketing agencies, lawyers, and more.  Rating 0/10 Views 741 Duration 00:42