A California law that goes into effect in September allows Cubans to legally sell their cigars for recreational purposes in the US.
That law also includes a provision allowing people to grow and possess their own small number of cigars, which are limited to 100 per person.
But in an announcement on Tuesday, the US Department of Justice said the law is still in its infancy.
“The U.S. Department of State continues to work with local authorities in some jurisdictions to review the potential impact of the new law and to ensure that it remains in place,” the department said.
The department is urging the Cuban government to follow the US lead and legalize small amounts of cannabis.
The move comes after the US Supreme Court ruled in March that the US Constitution protects the right to grow a small amount of marijuana in the home.
“As the United Kingdom decriminalized small amounts in the mid-1990s, Cuba has taken a different approach, but we remain committed to following the UK path,” the US department said in a statement.
The Department of Commerce is also reviewing the law, it added.
Cuban authorities, for their part, said the US government was not doing enough to make cannabis legal in the country.
“Cuba has been one of the leading producers of medical marijuana in Latin America and the Caribbean, and has established a solid cannabis infrastructure, but the United State government is not doing its part to legalize medical marijuana,” Foreign Ministry spokesman Alejandro Mayorkas told reporters on Tuesday.
“The US is a country with a very progressive approach to marijuana policy, but when it comes to legalization, it has failed.”