Aromatherapy diffusers, as the name implies, are devices that disperse aromatherapy scents around a room. Different aromatherapy vendors manufacture different types of diffusers. Some diffusers allow filling and refilling of non-liquid aromatherapy scents, and some are pre-filled with cotton absorb essential oils.

Diffusers are a convenient way of spreading a scent around an area. Diffusion can also be done using tissue paper, steam and candles. Steam diffusion is probably the best and the easiest way of diffusing a fragrance into a room. As steam heats the oil added to water, the oil evaporates and leaves a trail of fragrance in the room as the vapors disperse.

Lamp rings can also be used as diffusers. The oil stays in the ring of the lamp, and as the bulb heats the ring, the oil evaporates and spreads. Also, available are clay pot diffusers that resemble small terra-cotta pots. A clay pot diffuser contains an opening to add essential oils. A cork seals the opening. As the oil permeates through the pot, the diffusion of the aroma takes place. A fan diffuser, on the other hand, blows air into the oil and diffuses the aroma. Electric heat diffusers use heat instead of air to diffuse the scent into a room.

Another novel method of diffusing an aroma is using a nebulizer, which breaks an essential oil into fine particles and disperses them as small molecules around the area where the nebulizer is placed. Those who believe in a spiritual penchant for aromatherapy prefer a nebulizer diffuser that sends essential oil molecules directly to the lungs where they enter the blood stream and produce a desired therapeutic effect.