Chemical weapons have a side affect when it is being shot at, but it's not just guns it any other weapons filled with these toxins such as, grenades, bazooka's, tear gas, etc.
Last year Syria used these chemical weapons and attacked Ghouta and killed many of innocent people, more than 1,300 died on this attack, and it was upsetting and disturbing to watch videos I've seen on the internet to watch these people suffer and go through the a lot of pain.