Irregardless of the cause, the wildfires do pose health risks.
Those who have been lucky enough to avoid one may not understand how much smoke exposure is possible here. During a fire, the roads can be completely jammed, forcing people evacuating to be exposed to high levels of smoke for many hours. Significant amounts of smoke can go right through the air sealing on cars: a good respirator for every family member belongs in one's evacuation kit if one lives in a fire-prone area. After the fire, the smoke can stay in the air at lesser but still potentially dangerous levels for months after the fire.
Nobody really understands what health impacts these two different types of exposure will have, but for some people they could be serious. Just going to work means breathing potentially toxic air throughout the day for months at a time, since most workplaces will not have good air filtering (private residences can use air cleaners, which help quite a bit in my experience). This exposure can potentially cause long term lung damage.
To make things worse, the smoke toxins may interact in a non-linear manner with other airborne toxins present in many workplaces. The cumulative health effect may be considerably greater than the exposure to any single toxin would cause. The safety standards for exposure to things like asbestos (common in many older buildings) almost certainly underestimate the danger thresholds because the standards did not take into account having multiple toxins present in the air at the same time.
It is likely asthmatics and others with existing lung damage will be particularly susceptible to further lung damage.
In all likelihood, though many people may be experiencing long-term work-related injury as a result of breathing toxic air in the workplace following wild fires, this will not be handled by existing laws that protect workers, or agencies such as OHSA. Rather then adding further fuel to the climate change debate -- basically political posturing that does more harm than good -- it would be nice if the president actually did his job and tried to do something about the potential problem of lung damage resulting from breathing toxic air.
If we don't have good test and measurement equipment for determining the impact of fire-related toxins on the lungs, we should be researching what needs to be done to make that equipment. If we don't know how to medically treat lung damage, then we should be researching that. Given that entire communities are affected by this issue, it seems appropriate that the government should have some major role here, rather then relying on every potentially impacted individual paying for their own health care (and any research that may be required to fix problems).