From The Heartland Institute:

For example, State Budget Solutions estimated Medicaid savings could have amounted to $48 billion in 2012 had smokers enrolled in Medicaid switched to e-cigarettes. In 2017, the R Street Institute analyzed the effects of “1% of smokers [within] demographic groups permanently switching.” Applying the analysis to Medicaid recipients, the R Street author estimated savings “will be approximately $2.8 billion per 1 percent of [Medicaid] enrollees” over the next 25 years.