A fragmentation grenade, as smoke grenade and a CN grenade. The rule is. NEVER TOUCH THE PIN UNLESS YOU HAVE THE GRENADE OUTSIDE THE WINDOW!. Hit a bump and it drops on the roadside. Minimal drama. Inside the car? Party foul.

Using CN and Smoke. If you're caught in traffic and you have a bad feeling about a car behind you, toss the smoke. Most motorists will stop or at least give you a lot of space. It works and it's harmless. Be judicious about using CN and never while in tight traffic. Watching that cloud blow towards your car faster than you can drive is not fun. CN is rough stuff and I only would use it on those rare situations where it just has to be done. And the frag? Well we all know when those need to be used.

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