I used to smoke marijuana everyday for about a year. now everytime i smoke very little i feel dizzy & feel like im about to faint. any ideas why?

Could be interacting: One of your medications. Thc also disrupts coordination and balance by binding to receptors in the cerebellum and basal ganglia—parts of the brain that regulate balance, posture, coordination, and reaction time. Initial effect of smoking pot is generally increase in heart rate and blood pressure. In your case it sounds like the opposite is occurring. I can't explain that but it might not be a bad idea to make sure that you're not dehydrated and also get checked out by your family doctor to rule out anyunderlying cardiac disease that may be contributing to this response because it is not a typical response.Best wishes.