A vice president has to defer to the president's decisions on policy, but vice presidents can also help shape it. Dick Cheney pushed George W. Bush to invade Iraq, and Joe Biden gave Barack Obama a nudge to endorse same-sex marriage. Maybe Kamala Harris will convince Biden to push for legalizing marijuana.
There are reasons to think so. One was her laughing reply last year when an interviewer asked if she had ever smoked cannabis: "Half my family's from Jamaica. Are you kidding me?" Another is that as attorney general of California, she endorsed legalization of recreational weed, which the state's voters approved in 2016.