Marijuana is suppose to cause tahycardia,i.e increse in heart rate, Hallucination: which is why you were not able to focus on anything and in some cases respiratory distress:that is why you were having breathing difficulties. Next time before smoking Calm yourself,control your excitement,do not be over excited or hyper. Relax.. this is suppose to cause nirvana not tension!

I am not sure that was a question- but marijuana used to be prescribed for astma, it dilates your bronchi- and your blood vessels allowing you to breath easier. Unless you freak yourself out which you did. It is shown that marijuana increases heart rate to about the same amount as jogging up one flight of stairs- actually moving your bowels is over 40x more dangerous for you cariovascular system. Marijuana also protects from ischemia (heart attack and stroke) while having the ability to block TNF and ROS which cause artery hardening. There is really nothing to fear- tobacco gives COPD, emphysema and lung cancer. Marijuana does not