Alcohol changes how other body parts absorb THC as well. “Alcohol relaxes smooth muscle, so the arteries relax, which increases blood flow to many parts of the body. When you inhale marijuana, it crosses the barrier between the lung and the blood vessels,” explains Volpicelli. “Because there’s more blood flowing to the lungs, marijuana gets absorbed faster and more efficiently.” Marijuana is the most commonly abused illegal substance worldwide. While the number of people who use marijuana at any one time does not seem to have increased in the past decade, cannabis retail store design the number of people who have a marijuana-related disorder has increased significantly. This seems to be particularly true for elderly individuals as well as for young Hispanic and African-American adults. In teens, boys remain more likely than girls to smoke or otherwise use marijuana. Native-American adolescents seem to be the ethnic group most vulnerable to engage in recent marijuana use, and Asian adolescents tend to be the least likely.