Sometimes a character will suck or chew on something as a form of characterization. These range from toothpicks and blades of straw or grass to lollipops and cigarettes. Smoking Is Cool is an example, and it's possible that some of these are a way to capture the look while the No Smoking rule is in force. An Oral Fixation might also be a sign they are an ex-smoker, having substituted one habit for another. When food is used, this can overlap with Erotic Eating. Examples of Oral Fixation Fixation include: