Should I tell my parents that my sister is smoking?

Anonymous
I caught my sister (she's 12 and I'm 15) smoking with her friends (they were smoking too). My sister begged me not to anyone. My parents kill her if they knew and me for not telling them first. I'm going feel bad if she gets heart cancer or something. Should I tell my parents?
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My parents caught my sis smoking now she's mad at me because they'll making her quit and also because she thinks I told them which I didn't but I did tell them to go to her hang out early and pick her up. She's having bad mood swings tho.
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It was after school. My sister's middel school is close to my high school. When I saw she smoking again with her friend. When her friend left I came grab the cancer stick from her and stomp to the ground and called my mom and dad.
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Now she's grounded for a week. She won't talk to me at. what do I do?
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I was babysiting my sister (my parents don't turst her anymore). I didn't really have a problem with it. She said needed fresh air so I let her go out but she had to stay close to the house. 15 mintunes later I went check on her and she
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was smoking a cigarette again with her friend who lives very close to us (the same one I saw at her middle school). This time I didn't that her friend there or not, when out grab the death stick stomp it

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to the ground and yelled at her and her friend. Then she call me a controlling bitch and went off with her bud. I immediately called my parents. Now she's grounded until christmas eve. I am being to controlling?
Should I tell my parents that my sister is smoking?
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