Ive been a heavy weed smoker for 1 1/2 years and i passed out a couple times now after smoking do you know what caused it?

May be hypotension : If your normal blood pressure is normal or low normal, and you smoke potent marijuana, you may be lowering your blood pressure enough to cause syncope. (Passing out.). This can be increased with other substances including alcohol. Other things can cause your symptoms such as laying down and then stand up suddenly, known as “Orthostatic hypotension “. Some causes are more serious so see your MD if

Overdose: You have likely OD yourself since the current supply of pot is likely more potent than previous ones. It is time to cut down or quit .