How can I get away from the second hand smoke at work?

I work at a major retail store (which shall remain nameless). Currently, our store is undergoing a remodel and we have construction crews coming in and out a specific door designated for them in our back hallway. This door is always open during the construction hours, and because the workers are contracted out with a third party, we have to have someone guarding the door to make sure merchandise doesn't walk out with the workers and uninvited guests don't wander in.

And that door guard is me. I was delighted to be asked to do the job because I needed the extra hours. For the most part I like it, but there is one really big problem. It seems that every last one of the construction workers is a terminal chain smoker. And every time they pass out of that door that have to light up, and their toxic cloud wafts into my hallway where I'm stationed and fills it.

Now, I have to stay close enough to the door to watch it, but with the air so still of recent the smoke simply fills the hall and settles there for a while, meaning that I get to breathe it in and can't escape from it. Being as it is a toxic gas, and I have already been excessively exposed to it against my will growing up, I take serious issue with this.

The way I see it, I have four options:

1) Complain to my managers. The problem here is several-fold. Firstly, of the managers that I most have the opportunity to complain to, one is a smoker himself that will not likely empathize, and the other is unlikely to want to put for the necessary effort to do anything. Complaining to my store manager could be an option, but my access to her is very limited right now due to the remodel and my scheduling. Even if I got a complaint through, I must question how much can be done: after all, this is a third party contractor we are talking about, and my manager does not have direct authority over them. And as such, if I do make a fuss about it, I may be forced by management to go with the next possible solution, which is much easier than dealing with the workers:

2) Give up my current position. This would reduce my hours significantly, and would be a general bad thing for me right now. It also would not likely endear me to my store's managers after I told them I would do the job. And, aside from the smoke (which is not constant, though it is frequent), I like the job I'm currently doing.

3) I could simply put up with it. But it is decidedly not good for my health, it is being imposed on me against my will, and I should, by all reasonable accounts, not have to put up with it. I have been exposed to excessive amounts of second hand smoke in my life against my will already, and I did develop some breathing problems after many years of it. As I have removed myself from that smoke once given a choice about it, those breathing problems have entirely dissapeared, but I have never been examined to see what residual damage it may have done. I do not want to make any existing damage worse, or risk breathing issues coming back. Remaining in the current situation would risk that. After just three days of it, I am already feeling some effects, and nearly threw up from coughing last night at work.

4) Find some way to prevent myself from breathing the smoke. I have already attempted to research filters, commercial or otherwise, as a possible solution. The information I found was unsatisfactory, but suggested that existing filters are inadequate at filtering out second hand smoke. Tobacco smoke particles are very tiny, as small as .01 microns. I would have to find a filter that could stop particles this small and somehow craft it into a personal filtering device, but even then without more information on smoke, I don't know if there are other gasses that accompany second-hand smoke that could pass through such a filter and cause harm, such as carbon monoxide. I simply can't find enough good information to determine if such a filter would be worth building, even if I could find the material to build it out of.

So, I'm kind of stumped. Perhaps I'm missing options, or perhaps there are ways to make the above options work that I have overlooked or am simply not aware of. I would love some more ideas on how to deal with this situation. Also, any info on the legalities of these conditions in the workplace might be helpful. Any ideas, advice, references, or links are welcome. Ideas that can be backed by evidence, proper studies, or personal experience are very welcome.

Thank you for any answers in advance, and God bless!