NASAL DEVICES INCLUDING LAYERED NASAL DEVICES AND DELAYED RESISTANCE ADAPTERS FOR USE WITH NASAL DEVICES

Described herein are layered nasal devices including layered nasal devices having one or more stiffening members supporting the holdfast region of the nasal device. The stiffening member may be a stress-distributing member or a separate stress-distributing element or member may be included. In some variations the layered nasal device includes a stress distributing element to help prevent wrinkling, de-laminating, buckling, or otherwise disrupting the shape and/or activity of the nasal device. Also described herein are delayed resistance adapters that may be used with a nasal devices that inhibit exhalation more than inhalation (including, but not limited to the adhesive nasal devices described herein). A delayed resistance adapter may be activated to suspend or bypass the increased expiratory resistance of the nasal device. Suspending the increased expiratory resistance may allow the user to allow a user to acclimate to the use of the nasal device.