21 year old told me he's gonna go do drugs

I have 3 kids and two are college age but both live at home. My 21 year old is on his junior year of college and he said tomorrow and going to a party and dropped on me that there will be drugs and he is planning on trying them. He said it won't be meth or heroine. Stuff like ecstasy and molly. I asked why and he said he just wants to experience it. He's an adult and I can't tell him what to do. Just asked does he trust the people with these drugs that they aren't laced and he said yes. I don't know how to feel. He just dropped on me he's probably going to experiment with party drugs but he trusted me enough to say something. Idk how would you feel