Thanks for your question on Health Care Magic. I can understand your concern. At your age of 18 years, possibility of angina or other heart diseases is very rare. But since you are having habit of daily marijuana smoking, you are at increased risk of heart diseases. And so we need to first rule out cardiac cause in your case. Get done ecg and 2d echo. If both are normal than no need to worry for angina or other cardiac diseases. You might be having muscular pain mostly. So take simple painkiller and muscle relaxant drugs. Quit marijuana smoking as soon as possible. It is not good habit. Hope I have solved your query. Wish you good health. Thanks.