As of December 6, 2018, recreational marijuana is no longer a crime in Michigan. There are three misdemeanor marijuana charges that can now be removed from your record without a waiting period:
Marijuana use
Marijuana possession
Marijuana paraphernalia sales
Note that distribution of marijuana and possession with intent to distribute are not among the violations eligible for this fast-tracked removal. You can still apply to have them set aside (assuming you’re otherwise eligible), but it’s not as quick or automatic as a misdemeanor marijuana expungement. Also note that although there is no waiting period, these charges will not disappear automatically. You will still have to file an Application to Set Aside Conviction.