Why does my boyfriend keep lying about vaping?

He's lied 4 times about vaping. I found out through my friend that he was vaping because he was buying vapes from her. She thought I knew the whole time. Ever since I found out he said he was sorry and won't do it again. Then I found out 3 more times that he's been vaping behind my back. I don't support it and neither does my parents. If they ever found out that he vapes, I would have to break up with him. But I'd rather him tell me that he's getting back into vaping than me having to keep finding out on my own. I don't know what to do about it.

Why does my boyfriend keep lying about vaping?
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