Smoking marijuana quintuples a person's heart attack risk
Smoking marijuana quintuples a person's heart attack risk for an hour after lighting up, a study out Thursday said. As a heart-attack trigger, smoking marijuana is safer than a snort of cocaine or a jolt of intense exercise for a couch potato. But it is twice as risky as sex for a sedentary person or exercise for someone who is fit. Pot smoking hasn't emerged as an issue in heart disease because older people typically don't indulge.