This shows that people who vape should not worry about contracting the diseases popcorn lung. But Karen is not remotely interested in the yearbook's problems, or in the class voting itself a nuclear- free zone. Make sure to like us on Facebook to stay up to date with all your vaping news. The researchers at Harvard tested the chemical components of 51 types of e-cigarettes and liquid and found that 39 of these contained diacetyl.