According to the National Institute for Occupational Safety and Health, it is a big enough concern to recommend safety equipment in exposure at or above 0.1 ppm

According to the National Institute for Occupational Safety and Health, it is a big enough concern to recommend safety equipment in exposure at or above 0.1 ppm. So most of the activities / sources on that diagram don't warrant too much concern, other than cigarette smoking and fresh pain fumes. Although benzene exposure from cosmetics probably depends highly on what you are using. As per another reply here, those spray on sunscreens are are pretty terrible (likely due to using butane, propane, etc as propellants). Exposure can get as high as 6 ppm in some cases.