Living is hazardous to your health, it leads to death!!
Im sure with all the car exhaust fumes, industrial chemicals and pot head smoke we breathe in every day, a little coffee haze is not going to harm us that bad.
Also FWIW we have a coffee plant here in jacksonville. The workers are provided with plenty of fume masks, gas masks, filters etc to wear if they want. They offer the same in the power plants. Most choose NOT to wear them, yet if they get sick want to kick and scream. You were offered protection and refused it. Are you really that concerned on your health or is your union telling you to say that for some kind of compensation? Some of these 'concerns' we see are more times than not money grabs.
You can always find another job too, sorry but a coffee roaster is NOT one of the higher skill set jobs, your skills will apply in McDonalds as well really, no coffee smoke there to harm you.
I don't want to wear a seat belt because it's uncomfortable, and it's my RIGHT, to not wear it. Yet first time I go thru the windshield, IF I survive I want to sue the auto maker, and anyone else I can.
Working in a paint factory is dangerous too, that is why they give you PPE.... use it.
But back to the OP, unless you are roasting several times a day, or HUGE batches, the little smoke created is no worse than smoking a cigarette or cigar, cooking bacon in the morning, or a BBQ / Smoker. If your neighbors are that pussified that they will whine, well, tell them to put a plastic bag over their heads and it will protect them
Aaron