Now Playing: Mixed welcome for Pennsylvania's 1st medical marijuana dispensary

Now Playing: Colorado opens first drive-through marijuana shop

Now Playing: 1st case of coronavirus confirmed in US

Now Playing: CDC reports 1st case of Coronavirus in US

Now Playing: Sunscreen chemicals absorbed into bloodstream: Report

Now Playing: Is smoking marijuana as bad for your heart as smoking cigarettes?

Now Playing: Excedrin temporarily stops production

Now Playing: Ozzy Osbourne reveals health diagnosis for 1st time after a year of challenges

Now Playing: New coronavirus from China can spread by human contact

Now Playing: Mom does 5,332 burpees in 12 hours to help daughter with rare birth defect

Now Playing: What to know about the China coronavirus

Now Playing: Looking for “the match”

Now Playing: How this woman went from 350 pounds to 4-time marathoner

Now Playing: Breaking down the trendiest diets of 2020

Now Playing: Creating a screen time detox for your family

Now Playing: Department of Agriculture proposes changes to school lunch regulations

Now Playing: How to stay healthy during flu season?

Now Playing: 3 major US airports to check incoming passengers for potentially deadly virus

Now Playing: 3 major US airports on alert for mystery virus

Now Playing: HIV campaign suspended over raunchy condom packaging