Smoke!!!

[low_bidder]

Attack! That smoke works both ways.
Make a best guess as to if he has seen you or not. It's hard to do for new guys, but a rule of thumb is the difference in Experience levels, range and the size of your vehicles. More often then not you'll have to guess at the range, since you will just have a rough idea of where he is.
Range works in sections. < 4 hexes, 4 to 8 hexes, 8 to 12 hexes and under 20 hexes. At 20+ hexes in a < size 5 vehicle and exper levels within 10 points of your opponent, you prolly aren't going to be seen . Inside 4 hexes anything other then a zero sized unit will be seen. Between 4 and 20 hexes, size and experience become important. I'm assuming you are in a ready status.
If you think he has seen you move a hex or so. 1 hex gets you the moving target bonus without the big penalty as a moving shooter. If you have a good FC ( 25+ or so) you can add 1 hex, if you have a stabilizer add another 1. That means you can move 3 hexes or so and still fire with accuracy. Not like sitting still but good enough. What you are doing is making him think and getting a better shot when he comes out of the smoke. Remember, if he HAS seen you and you move, your units will disappear on his map. That will make him wonder what you are up to. As the great Kahn used to say; 'Confusion to your enemy'.
If you don't think he sees you, hug the smoke with the goal of popping thru it next turn, shooting and popping back. Sort of a jack-in-the-box tactic or what is also called king of the hill, when done over a hill.
'Course he could be laying smoke just to see if you will try something clever.
Some of these old gits are just to sneaky!