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Hi, This is Chat Doctor. Innocent murmur is generally benign & if the echo is normal than it will not affect you. But still smoking Marijuana or any such weed pose a very high risk to these individuals. The symptoms you are telling are related to marijuana smoking only. There is also risk of arrhythmia(supraventricular arrhythmia) after smoking this. This tachycardia can be problematic at most time. So I suggest you to avoid marijuana smoking as much as you can. Also, if you won't leave it at proper time than you can become addicted to it. So be healthy & be safe. Regards