In Pictures: Facts about marijuana and the new law
Marijuana facts
Credit: Getty Images
Marijuana increases heart rate by 20-100 percent shortly after smoking; this effect can last up to 3 hours. In one study, it was estimated that marijuana users have a 4.8-fold increase in the risk of heart attack in the first hour after smoking the drug. This may be due to increased heart rate as well as the effects of marijuana on heart rhythms, causing palpitations and arrhythmias. This risk may be greater in aging populations or in those with cardiac vulnerabilities. (Source: National Institute on Drug Abuse)
Other Slideshows
PHOTOS: Behind the scenes 
I-5 bridge over Skagit River collapses, cars with people in water
Peek Inside: Stan Musial's $1.8M Ladue home for sale
Dresses Kellie Pickler wore on 'DWTS'
Photos: Warming up for Senior PGA Championship at Bellerive
Remains of KC-135 airmen return to Fairchild AFB
