How does one react to this?!

Idk how I was meant to react but my mom said she is growing weed and magic mushrooms with her bf. In the past she used to be a drugs addict and it affected our relationship, to a point I doubt I will ever forgive her fully. To find out she is trying to make shrooms worries me, because, despite being 10 yrs clean, and taking medicine to resist, what if she relapses? What do I do?! How do I get rid of this worry?