Hi Dear, Welcome to HCM. Understanding your concern. As per your query head rush after smoking Marijuana is because marijuana is cannabis and the drug is known to produce intense excitation and leads to anxiety symptoms which can lead to dizziness, increase heart beats and chest pain due to muscle spasm. Head rush could be because of panic attack. You should take anti anxiety drugs like Beta Blockers especially Propranolol or Atenolol can help to reduce your symptoms and take benzodiazepams as well. Avoid smoking smoking marijuana. If ever you will take that go out for ventilation and not in closed space. Visit physician once if anxiety attacks increasing as this is something you need proper check up and you have to quit your habit. Hope your concern has been resolved. Best Wishes, Dr. Harry Maheshwari