Ok so they are calling them kids, so you have to too?

Yes I do. If the legislators can get away with it and you agree with them, how is it wrong?if they're too young to decide if they want to smoke or not how can you justify allowing them to enlist? You still haven't answered this,you just keep saying it's different, but it's not.

Are cigs and alcohol bad for your health? Yes

Is joining the military bad for your health? Of course

Are they different and have different laws? Yes

And that's the problem. The rest is irrelevant. You can't have your cake and eat it too, either these KIDS are too young to smoke and drink AND shoot people for their gov, or they are adults and ready for all of it.