Humidifiers and vaporizers add moisture to the air, making it less drying to your mouth, throat, and nose. A humidifier blows cool to lukewarm mist into the air, and a vaporizer puts out hot steam.
The mist from a humidifier may be more comfortable to breathe than hot steam. But humidifiers are noisy, produce particles that may be irritating to some people, and need to be cleaned and disinfected regularly. Cleaning is especially important for people who have mold allergies.