I dealt with a teenage girl for a while in the late nineties that habitually cut herself with razors, but she never did it in a group environment. I learned that this is fairly common to teenage girls with self-esteem issues.
Coercive thought reform environments can easily have long ranging effects regardless of the length of time spent in the high demand group. As each person is an individual, and each of us were involved to differing degrees, those aftere effects will accordingly manifest in a broad range of behaviors, attitudes, beliefs, opinions, habits, obsessions, compulsions, memories, dreams and perhaps most alarmingly relationship and social skills, or lack thereof.
As I have stated elsewhere, the modality, like all high demand groups, seeks to imbue a sense of doctrine above person, to eliminate our sense of personal autonomy, and to destroy our capacity to question authority in a rational and socially acceptable manner.
Hence, in my own case, I spent two decades going from job to job because of my group induced personality traits- specifically I could not rationally express my disagreements with authority figures in the workplac, and tended to simply walk off the job.
The good side of this is that once I indentified these traits, and their source, I had the opportunity to make conscious decisions to adjust them, to learn to escape the induced traits and adopt a new set of behaviors- without coercion, or the abuse present in the high demand group.