In addition to speaking with you school about how/what they will report, I think you need to look at the wording of your acceptance and what Rutgers require you to report. I know that many school consider these suspensions an internal matter and do not report to colleges, however, the Common App asks you to self-report any discipline since Grade 9. Since you were suspended after Common App was submitted and after acceptance, you need to find out what the college requires you to report.
In my personal opinion, this is probably not the type of offense that would result in rescinding. If it had been violence to another student or cyberbullying that might be viewed more seriously. As vaping has become more of an issue, high schools are cracking down and the punishments are severe compared to the crime.