Two Midwestern states are breaking into the recreational marijuana market, and dispensaries are expecting huge crowds.

Legal weed sales began Sunday in Michigan, where a handful of dispensaries in Ann Arbor planned to be open for business. The landmark moment in the state’s cannabis industry comes amid a temporary ban on the sale of vaping devices in Michigan as health officials investigate the causes of vaping-related lung illnesses nationwide.

In Illinois, where officials are grappling with a lack of racial equity in the cannabis industry, sales are expected to begin New Year’s Day.

The states are the 10th and 11th nationwide to allow recreational marijuana sales.