I found cigarettes in my older brothers room, what do I do?

So my brother is 16 and he has always told me that he would never smoke and that it was disgusting... I went into his room to get his laptop to do homework on and found them. I saw him smoking a few months ago and confronted him, he told me a week later that he had stopped and he obviously hasn't... What shall I do?
I found cigarettes in my older brothers room, what do I do?
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