The 48-year-old former New Jerseyan, who now lives in Los Angeles, could have received up to 18 months for possessing marijuana.
Judge Charles Delehey allowed him to serve his probation in California. He also ordered him to begin paying his fines at the rate of $100 a month.
Forchion said he planned to appeal his sentence on the ground that he would "qualify for medical marijuana in New Jersey" but was still prosecuted. He has a license to use medical marijuana in California, but New Jersey does not recognize it.
He has a rare disorder in which bone tumors multiply in his body, according to his doctor's reports.
New Jersey is one of 18 states that view the use and sale of marijuana as criminal except when there are medical reasons. Forchion was visiting family and friends in New Jersey when he was arrested on April 1, 2010.
Forchion admitted possessing the drug, which was found during a traffic stop, but argued that he used it for medical reasons and did not intend to sell it.
Legal authorities said Forchion was the first criminal defendant in New Jersey to be allowed to base his defense on his license to use medical marijuana.
But Delehey barred Forchion from "putting New Jersey's marijuana laws on trial," saying the jury's function was to judge the facts, not the laws.
Assistant Prosecutor Michael Luciano recommended 12 months in prison, noting Forchion's criminal record, including theft charges and a sentence for conspiracy to distribute marijuana. Forchion served 18 months in 2001-02 on the conspiracy charge.
Don Ackerman, Forchion's public defender, said his client had only minor municipal offenses since then, mostly related to his pro-marijuana protests. He also argued that Forchion was receiving experimental treatment for his tumors that appeared to be working and that they could not be continued if he went to prison.
The judge said probation was warranted because Forchion did "not fit among a group of hardened criminals that include murderers [and] rapists," and has painful bone tumors that require treatment.
The experimental treatment Forchion is getting at a Santa Monica oncology center is "producing results," according to doctors' reports, the judge said, and he should continue the program.
In January 2010 - three months before Forchion's arrest - a law was signed in New Jersey allowing marijuana to be sold to patients with certain serious illnesses, including cancer and multiple sclerosis.
The law limits the drug to residents who get special identification cards after their doctors certify they have such ailments. Only licensed dispensaries can sell the drug.
After several delays, the state's first and so far only nonprofit marijuana dispensary opened in Montclair in December.
To view video of an interview with "NJ Weedman" Ed Forchion, go to
Contact Jan Hefler at 856-779-3224, email@example.com, or follow on Twitter @JanHefler. Read her blog, "Burlco Buzz," at www.philly.com/BurlcoBuzz.