8 billion people in the world and only 8 got popcorn lung that worked in a popcorn factory for decades breathing in the raw chemical. You have a better chance winning the Grand Prize: 1 in 292,201,338.00 in Powerball 3 1/2 times over. A vaper will have to vape constantly pure diacetyl for decades 3.78 liters every few weeks for decades to get a 1 in 1 billion chance of getting popcorn lung. The odds are not with you Tahir.