SMOKE, more thoughts

1. Limit smoke rounds: Good idea, bookkeeping pain. We don't track HE 
grenades.... 

2. Say smoke takes one ACTION (not activation) to thicken up to 
acceptable levels (hard cover). Otherwise it is soft cover. This 
means if you pop smoke as your first action, by the end of your 
second action, it will be hard cover. If you pop it as your second 
action, your opponent will get one action to shoot at you while you 
are in only soft cover. 

This probably fits within the timescale of the game (you can't really 
justify it taking turns to erect a screen....). But it does take a 
time amount that is significant if you are in the sights of the 
enemy!