At first glance, it would seem like the number of vampires that smoke is actually rather astounding... until you realize that the health problems caused by such are no longer a concern, thanks to immortality.
And with virtually no one eating solid food anymore, farmers might as well grow tobacco, so it's probably a whole lot cheaper.
That would be interesting to see in this universe - the vamps would be harvesting at night.
The vampire military hasn't thought to try developing stake-proof vests. Modern police have developed stab vests, how much modification would they take to resist stakes as well? Also why do they wear helmets? Wouldn't getting shot in the head have no effect on them?
It veers into wall-banger territory when close-ups show that their futuristic armor clearly has armored shoulder pads but no heart-covering stake-proof plating.
Bullets may not kill them, but they may suffer temporary wounds that splatter blood around before they heal. With a crippling blood-shortage going on and most of their fellow soldiers half-starved, spraying the red stuff all over is probably not a good thing even if the leaks do plug themselves within seconds. Plus, those shoulder pads might actually come in handy if a rampaging subsider tries to feed on a vampire and isn't picky about biting just the neck.
Also, the only thing that vampires eat is blood. So why is their puke white instead of red?
Maybe their bodies only metabolize red blood cells, leaving the white ones undigested?