San Francisco is the cannabis capital of America, new data shows.

In fact, the entire West Coast has far more pot smokers than the rest of the country, and a more positive opinion of what the drug does to your body.

Once you reach 12, you are far more likely to light up a joint in California, Colorado, Oregon and Washington than anywhere else in the United States.

Southern Texans, meanwhile - particularly those living near the Mexican border - are less enamored by the drug.

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Pot hot spots! Marijuana use in the past month among people aged 12 or older, by substate region. The data is based on a federal survey conducted over two years from 2012 to 2014, showing a buzz on the West Coast

The findings have emerged in a new report by the Substance Abuse and Mental Health Services Administration (SAMHSA) compiling federal about marijuana smokers between 2012 and 2014.

In the survey, 204,000 respondents described their cannabis use.

The figures have now been mapped out to give a picture of where weed has taken off in the states.

Over 15 per cent of San Franciscans above the age of 12 smoke cannabis each month.

In contrast, less than four per cent of people in South Texas smoke cannabis.

The national average is somewhere in between: around 7.7 per cent of Americans (20.3 million people) will have smoked weed in the past month.

That is an increase of around 1 per cent since the previous report (2010-2012).

It comes amid a national conversation about legalizing medical and recreational marijuana.

But according to SAMHSA's statisticians, there hasn't been a widespread uptick in appreciation for the drug.

People are most concerned about the risks of regular marijuana use in Florida.

Just under half of residents in Miami-Dade County and Monroe County fear that it could have detrimental affects.

That figure may go some way to explaining the fierce debate over marijuana in Florida at the moment.

California and weed: This data shows that people in northern California and San Francisco smoke the most (above) and people in Los Angeles are the least concerned about what the drug could do to your body (below)

Opinion of weed: This map shows the perceived great risk of harm from smoking marijuana across the US

Just this week Florida opened the state's first medical marijuana dispensary in Tallahassee.

It followed two years of disputes and attempts by the medical community to legalize dispensaries.

But even after the center opened - with another 19 expected to follow - Florida-based anti-drugs groups were storming Twitter with their anger.

People are least concerned about the health affects of cannabis in in Ward 3 of Washington, D.C., where just 14 per cent of people harbor concerns.

Recreational use of marijuana is legal in five of the areas that showed high rates of marijuana use - Alaska, Colorado, Oregon, Washington state and the District of Columbia.

Medical marijuana is legal in another 20 states.

'This report provides a very detailed understanding of marijuana use and perception patterns in communities across the nation,' said Fran Harding, director of SAMHSA's Center for Substance Abuse Prevention.