I'm not up with the newest teen fads - But I said I would ask for a friend. What would cause extreme weight loss (over 100 lbs.) in 2-3 months, in a girl. She is a cigarette smoker, but has been caught with a stronger than cigarette smell or a super cigarette smell. Her Mother said she thinks it's from the anti-depressants she's taking. I said not likely but I would ask. She's also been described as having a SUPER witchy personality, short tempered, gone from being a compliant 18 year old to a - get out of my face I'm 18 year old - attitude. Dropped a nice, but lazy boyfriend of 3 years for a 20 year old, drop out, with no job, no car, not good looking, piercings, no redeeming qualities. Bad end of town kinda kid. This is a girl who was going to go to college in the Fall and now couldn't care less about finishing HS. because she knows it all. Anythoughts appreciated - I was thinking speed/meth but I don't want to say anything and have this Mom go off the deep end in case AD's could do this in a teen, like if she's just stopped eating or something. Mom works 2 jobs so she's not home to see the eating habits - and kid swears she eats out and at the boyfriend.