In a 19 year period from 1980-1999, 32k servicemembers died from various causes.
http://www.allcountries.org/uscensus/582_u_s_active_duty_military_deaths.html
Of that, slightly less than 6k died of “illness”. “Illness” is not defined, but I can sure imagine that not ALL are smoking related.
So, using that DoD “memo” for anything other than propaganda is disingenuous.
You need to count inactive military too.