Lafco Feu de Bois Smart Diffuser Refill The mesmerizing light of the flames and rhythmic crackling of the blaze create a warm ambiance. Fresh pine falls on curls of sandalwood and rare Virginia cedar wood. Smoky leather accords, frankincense, and nuances of vanilla are tranquil and comforting. This is the fragrance refill vial for the Smart Diffuser powered by Pura.