Americans think President Obama should leave states that have legalized medical marijuana alone, a new poll finds.

In survey of 1000 likely voters, Mason-Dixon Polling and Research found three-fourths of those polled believe President Obama should respect laws in states where growing and selling marijuana is legal for medical purposes. Fifteen percent of respondents favored enforcing federal law, under which medical marijuana use is illegal.

Sixteen states and the District of Columbia have legalized medical marijuana, most recently Connecticut. This has not kept individuals and dispensaries from being prosecuted under federal law by the Department of Justice and U.S. Attorney's Offices around the country.