Marijuana—also known as marihuana or cannabis—is classified as a controlled substance under federal law, and its possession, use, and distribution is illegal. See 21 U.S.C. §812.

But many states have recently passed laws that generally legalize marijuana in some form. For example, Alaska, California, Colorado, Illinois, Maine, Massachusetts, Michigan, Nevada, Oregon, Vermont, and Washington have enacted laws legalizing marijuana for recreational use.

The District of Columbia allows all citizens over the age of 21 to possess up to two ounces of marijuana, to use and grow marijuana on private property, and to exchange marijuana between persons as long as no money, goods, or services are exchanged.

And some states that do not allow recreational use of marijuana do allow limited use of marijuana to treat symptoms of illness and other conditions—known as medical marijuana. States that allow limited use of medical marijuana include Arkansas, Arizona, Connecticut, Delaware, Florida, Hawaii, Louisiana, Maryland, Massachusetts, Minnesota, Missouri, Montana, New Hampshire, New Jersey, New Mexico, New York, North Dakota, Ohio, Oklahoma, Pennsylvania, Rhode Island, Utah, Vermont, and West Virginia. The medical marijuana laws in some of these states are broader than others, with some states only allowing use of cannabis-infused products such as oils and pills. Federal law prohibits health care practitioners from writing a prescription for medical marijuana, so practitioners in medical marijuana states write a recommendation for medical marijuana.

Other states have not legalized marijuana, but have decriminalized it—meaning possession of small amounts of marijuana is not punishable by jail or prison time, but may be punished with a fine. States that have decriminalized possession of marijuana under limited circumstances include Connecticut, Maryland, Mississippi, Nebraska, New Hampshire, New Mexico, New York, North Carolina, and Virginia.

Marijuana laws are generally located in a state’s statutes—often in the penal or criminal code, or in the health and safety code.

In Florida, marijuana is classified as a controlled substance under federal law, which makes its possession, use, and distribution illegal according to 21 U.S.C. §812. However, Florida has passed laws allowing the limited use of medical marijuana. This means that while recreational use of marijuana remains illegal in the state, individuals with certain medical conditions may be eligible to use marijuana for treatment purposes. Florida's medical marijuana program permits the use of cannabis-infused products such as oils, pills, and in some cases, flower, for qualifying patients. These patients must obtain a recommendation (not a prescription, due to federal restrictions) from a certified physician in the state. The possession and use of marijuana for non-medical purposes can lead to legal penalties, as Florida has not decriminalized marijuana to the extent that some other states have. It's important to note that despite state laws permitting medical marijuana, federal law still prohibits its use and possession, which can lead to legal conflicts.