Can skin become accustomed to Retin-A when used for acne therapy?

I've been using my Retin-a 0.025% gel for 3 weeks and my skin has never looked better. For the first time in 7 years my skin is acne free and clear. I was wondering if your skin can become accustomed to retin-a and acne can come back? And is there a retin-a stronger than 0.025% in the gel form?

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