There is no need for you to use your fog lights in this weather*.
I hope that a large percentage of the people who share the roads on which I commute read this blog. Recently the weather has been "foggy." I would suggest a better word would be "mist," which I would define as not as thick as fog.
Now, "fog lights", that all of our cars are equipped with are there to make us more visible to other drivers. This is their purpose.
If I am driving 10 metres (or similar) behind you, and can see the colour of your car, and read your number plate, you do not need to use your fog lights to make yourself more visible to me, or whoever is behind you.
When driving in bumper to bumper traffic, turn those fog lights off. It is actually a hazard to have them on as 1) it can be dazzling to the people behind; they cannot see as clearly what lies ahead
and 2) it hampers the contrast effect of your brake lights, which are designed to draw attention even from the peripheral vision of the driver behind.
Please drive sensibly.
* The exception is if you are the last car in the traffic. In that case it is prudent to use your lights to draw attentation any cars who may catch up behind you. Once a car has caught up however, turn 'em off. The law states that you should turn them on, and off "when required."