Spicer`s comments came on the same day that a nationwide poll from Quinnipiac University in Hamden, Connecticut, showed 71 percent of registered voters favored allowing states to decide whether marijuana should be legal.
"I do believe you`ll see greater enforcement of it," Spicer said at a news conference. "Because again there`s a big difference between the medical use ... that`s very different than the recreational use, which is something the Department of Justice will be further looking into."
Spicer`s comments drew criticism from the country`s nascent legalized marijuana industry as it was recovering from a scare after Trump`s nomination of former Alabama Senator Jeff Sessions, a long time anti-drug campaigner, as attorney general.
"It would be a mistake for the Department of Justice to overthrow the will of the voters and state governments," Aaron Smith, executive director of the National Cannabis Industry Association, said in a statement.
Seventy-five percent of cannabis stocks in an index followed by Arcview Market Research dropped on Thursday after Spicer`s remarks, analyst Michael Arrington said in an email.
A spokesman for Sessions, who was confirmed as attorney general earlier in February, declined to comment on marijuana enforcement on Thursday.
But during his confirmation hearings, Sessions said his job was not to enforce only some laws.
Marijuana remains illegal under federal law, but it has been legalized for recreational use in eight states, including Washington, Colorado and California, as well as the District of Columbia. Last year, legal sales reached $7 billion and generated half a billion dollars in sales taxes.
Among registered voters in the Quinnipiac University survey, just 23 percent said the U.S. government should enforce federal laws against marijuana in states that have legalized it for recreational or medical use, and 71 percent said it should not.
The poll of 1323 registered voters, released on Thursday with a margin of error of plus or minus 2.7 percent, also showed support for marijuana legalization among 59 percent of respondents, with 36 percent opposed.
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