If I completed TASC (drug diversion program) is there a waiver allowing me to adjust status to Green Card or am I barred for 15 years?

I am in the country on a student visa. Last year I was arrested last year for possession of less than 30 grams of marijuana. I completed TASC (drug diversion program) and my case was dismissed with prejudice. I did not admit guilt in order to participate in TASC. When I went back home to renew my student visa, I was told I was inadmissible but that I could apply for a waiver. I gave the consular all my court records and received the waiver/visa. Now I have been offered a job/work immigrant visa. I am wondering if there is a waiver that allows me to adjust my status to Green Card when the time comes or if I fall under the 15 year bar.