Catelynn disclosed during a previous Teen Mom OG episode that she smokes marijuana -- but when did the 25-year-old first begin using cannabis?

"I started smoking weed when I was probably around 12 or 13, which I'm not proud of. But that was when I was young and crazy," the Michigan native -- who opted to get help for lingering mental health issues in this week's installment -- discloses in the video above.

Saying goodbye to her loved ones was understandably emotional -- but what was the hardest part of leaving her family for an extended period of time? Hear Catelynn open up about the experience in the clip -- and be sure to keep following her journey every Monday on TMOG at 9/8c (peep a sneak peek featuring Tyler from the next installment below).

If you or someone you know is struggling with depression, or just wants someone to talk to, there are people who can help. Head to halfofus.com for information and resources.