Make sure to throw your smoke grenade in an area where there is little to no wind. Strong winds will just make the smoke dissipate faster defeating the purpose of a smokescreen for your attack. Smoke will stay on the area for a longer period if you don't have wind to blow it away.
It's also a good idea to throw your paintball smoke grenades in the woods because such areas are capable of holding smoke longer. The only downside of this tactic is that you might produce thick smoke which will make it more difficult to navigate through roots and branches.
It's best that the whole team knows at least how the grenade will be used before you go around throwing them.
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