SN instructed the patient to keep oxygen away from any open flame to include smoking and also in-home pilot lights such as stove, furnace and water heater. Oxygen produced from concentrator and oxygen tanks is flammable. Call your company for a humidifier if causing nasal dryness or you may purchase lubricants made for oxygen use at your local pharmacy. Do not use Vaseline or petroleum based products as these can cause irritation and skin complications. Post no smoking / no Open Flame signs.