Toner as part ofskincare routineshas been around for decades (viaByrdie).
Particularly for those who had acne as a teen, they probably used it.
Perhaps you still use it today even though it’s not the skincare must-have it used to be.

Toner is applied after cleansing your face and before using serum and moisturizer.
Dr. Alicia Zalka, a Yale-affiliated dermatologist, toldHuffington Postthat toner is the second step in the cleansing process.
“To some extent, a toner can help other skin applications penetrate more rapidly.

Those are traditionally alcohol-based preparations.”
Being too aggressive with products could also lead to poor outcomes.
It’s essential to know your skin and what does and doesn’t help.