In conclusion, I would suggest that a gas mask, used properly, would be useful in the event of an attack (provided you know how to use it and you're aware of the attack in time to put it on). However, I would not feel compelled - despite current threats - to rush out and invest large amounts of money in them.

They are nice to have, and I would rather have and not need than need and not have.

Hope this has helped.

Izzy