Is this a valid reason not to drive my car?

I recently found out my truck has a blown head gasket. I found out after I took it to a mechanic. They put some Block seal on it and said I have 6 months to a year until I have to replace the head gasket. What im worried about is when the truck is running, a lot of white smoke comes out of the tail pipe and it smells like antifreeze. I did some research and it said that when a car has a blown head gasket it releases water vapor and antifreeze into the air. I don’t want to drive around if I’m releasing antifreeze into the air and pollute the environment. If I have to take a taxi, vocational rehabilitation will pay for it but there has to be a valid reason I can’t drive my truck. Is this a valid reason?