Not to ruin your high, but habitually smoking marijuana has been known to take a toll on the body . It can irritate the lungs, damage blood vessels and accelerate heart rate. Not to mention the scromiting , the screaming — and vomiting! — that can accompany long-term, heavy use. The brain also takes some hits. “From a brain imaging perspective, marijuana use is consistently associated with measurable changes in brain function,” Dr. Daniel Amen — founder of Amen Clinics, which has conducted