"Western and Northeastern states have led the way on legalizing marijuana, but the victory in MI powerfully demonstrates the national reach of this movement", Maria McFarland Sánchez-Moreno, executive director of the Drug Policy Alliance, said in a press release.
People 21 and older will be allowed to carry 2.5 ounces of marijuana on their person, store 10 ounces at home and grow up to 12 plants per residence.
MI now joins nine other states that have legalized marijuana for all uses: Washington, Colorado, California, Oregon, Alaska, Massachusetts, Maine, Nevada and Vermont.
In Michigan, passage of Proposal 1 would legalize marijuana use and possession for adults 21 while paving the way for the state to set up a system for taxing and regulating retail sales.
In Utah and Missouri, voters on Tuesday decided that patients should have access to medical marijuana. Under the measure, adults can be in possession of 2.5 ounces of marijuana, a provision similar to the state's medical marijuana law that was approved in 2008.
In Missouri, voters will be asked to chose between three separate proposals legalizing medical marijuana to varying degrees.
Missouri voters opted to approve the sale of medical marijuana with a 4 per cent tax on cannabis sales with the revenue dedicated to health care services for US veterans. Municipalities can choose to ban or restrict marijuana businesses within their borders. Beginning in 2021, medical marijuana cardholders who live more than 100 miles from a state-licensed dispensary would be allowed to grow as many as six marijuana plants for personal medicinal use. The department can issue special licenses allowing on-site consumption, subject to local approval. If more than one measure passes, the proposal with the largest affirmative vote will become law.