Thanks to David B. for this interesting research:

From the Bribane Times: 

Marijuana is not kosher for Passover, a pro-cannabis advocacy group says, advising Jews who observe the week-long holiday’s special dietary laws to take a break from smoking the weed.

The Green Leaf Party announced Wednesday that products of the cannabis plant have been grouped by rabbis within a family of foods such as peas, beans and lentils that is off-limits to Jews of European descent during Passover.

The Green Leaf Party, which has made several unsuccessful attempts to win election to parliament on a platform urging marijuana’s legalisation, said it was issuing its advisory as a service to Jews who don’t want to break ritual law.

But it said the rabbinical ban for the holiday beginning at sunset Monday, during which many Jews eat matzos, or unleavened bread, could be a blessing in disguise.

“Logic dictates that if the rabbis say cannabis is non-kosher for Passover, it is apparently kosher during the rest of the year,” Michelle Levin, a spokeswoman for the party, told the YNet news web site.