Michigan's had medical weed for over a decade and passed recreational back in November. While there are dispensaries for medical weed all over Michigan recreational store-fronts won't open until later this year. And it's likely the existing medical dispensaries will be the first recreational store-fronts to open/convert after the state issues the first batch of licenses on November 1st.
However, the law passed by voters back in November immediately (well, like a few weeks after the vote) made possession of up to 2.5 ounces of weed legal in Michigan. The law passed in November also, curiously, made "gifting" up to that amount to another adult (21+) legally kosher. So all of these businesses selling $100 t-shirts and $30 socks with a free gift of a cannabis product have popped up.
Although they'd prolly be better off bundling the weed with a sales-tax exempt service. Selling someone a 15 or 30 or whatever minute "consultation" (astrology sign reading, life-coaching, tutoring or whatever) with a free-gift of a cannabis product would avoid having to collect and pay Michigan's 6% sales tax on goods sold.