Why do some Blessthefall lyrics have bad words?

Blessthefall is a Christian metalcore band, and their lyrics are generally not considered to be profane. However, there are a few songs that contain some strong language, such as the song "What's Left of Me." This song contains the line "I'll take the blunt of what's left of me," which uses the word "blunt" to refer to a marijuana cigarette. Some listeners may find this language to be offensive, while others may not. Ultimately, it is up to the individual listener to decide whether or not they find Blessthefall's lyrics to be appropriate.