Smoking fetishism ("capnolagnia") is a sexual fetish base on the sight or image of a person smoking. The smoker is commonly female, since most smoking fetishists are heterosexual males. For many of them, the fetish appears to have had its roots in early childhood. Some smoking fetishists merely observe, while others become personally involved with smokers. Several online vendors cater to the fetish with videos and photos, which often also show explicit sexual acts.