You may find this a good read:
Nunez-Reyes v. Holder, (No. 05-74350 Filed July 14, 2011) 9th Circuit prior decision in Lujan-Armendariz v. INS, 222 F.2nd 728 (9th Cir. 2000),
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An alien may be rendered inadmissible under section 212(a)(2)(A)(i)(II) of the Immigration and Nationality Act, 8 U.S.C. § 1182(a)(2)(A)(i)(II) (2006), on the basis of a conviction for possession or use of drug paraphernalia. Findings of juvenile delinquency are not convictions for immigration purposes. There is no indication that Congress intended to include acts of juvenile delinquency within the meaning of the term “conviction.”
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You should be okay. Marijuana and as long as it wasn't alot of it then you're fine.
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Juvenile cases are not considered in immigration proceedings because those cases do not involve convictions.
Your citation for possession of marijuana should not interfere with your ability to obtain a US citizenship.