Laws about the use of marijuana are changing rapidly and can be confusing. Laws differ by type of use, such as medical or adult-use, and they also vary by state. While many states allow for medical use of marijuana and an increasing number of states also have legalized marijuana for adult use, marijuana use remains illegal at the federal level, and adult-use marijuana is illegal for individuals who are under the age of 21. Parents, or those in a parenting role, and teens are often unclear about the laws and have misconceptions about the consequences of breaking the laws.