MILEY’S a DOPE! The 411 ABOUT HER 420 FETISH thumbnail

MILEY CYRUS has admitted she smokes marijuana – even though her doctors have warned her to steer clear of it.

The 20-year-old former “Hannah Montana” star stated in her autobiography that she has been diagnosed with a potentially deadly heart condition, called tachycardia, or an elevated heart rate. But medical experts warn smoking dope can increase a person’s heart rate, and a source said that’s just what’s happening to Miley!

“Miley suffers from episodes of rapid heartbeats that scare her and leave her breathless,” said a pal.

“Her doctors have told her to stay away from stimulants like caffeine, alcohol and weed, but she still insists on smoking and drinking tons of coffee – even though it affects her heart rate.”

Medical experts say THC, the mind-altering ingredient in marijuana, can speed up the heart rate, triggering bouts of tachycardia. The increase in heart rate is greatest in the first 10 to 20 minutes after smoking, but it can last for several hours.

Miley told talk-show host Jimmy Kimmel in January that she and pal Snoop Lion, formerly known as Snoop Dogg, have a lot in common because they both get high. The “We Can’t Stop” singer also admitted in a recent interview: “When I smoke I don’t get that sick feeling I get when I drink – or that anger rising up.”

The source added: “Miley has been smoking dope for a couple of years, although she kept it hidden from her fans until recently. Miley knows she probably shouldn’t be smoking, but she loves getting high. Besides that, most of her friends smoke too, and she’s not prepared to give it up even if it sends her heart racing.

“As a Disney star, she had to maintain a ‘good girl’ image for years. Now she feels she’s going to do what she wants…and that includes getting high.”