A pack and a half a day for 2 years = 730 days X 30 cigs/day = 21,900 cigarettes not smoked.
104 weeks in two years @ $55 per carton of cigarettes = $5,720 that I haven't given to the tobacco company and the state and federal governments from sin taxes I haven't had to pay. SWEET!
If you multiply that by, lets say, 1mil smokers who are now vapers = $5,720 X 1,000,000 = $5,720,000,000. Of course there's more than 1mil smokers who are now vapers, so the amount is even higher than $5.7bil.
Now, that is a serious amount of money don't you think?
EDIT: That is based on vapers who quit smoking for 2 years. It can easily be an average amount when you do the actual numbers using 5 year vapers and 6 months vapers.