They may mistakenly think that those who use drugs lack moral principles or willpower and that they could stop their drug use simply by choosing to. Fortunately, researchers know more than ever about ...They may mistakenly think that those who use drugs lack moral principles or willpower and that they could stop their drug use simply by choosing to. Fortunately, researchers know more than ever about how drugs affect the brain and have found treatments that can help people recover from drug addiction and lead productive lives. Before further studying addiction and recovery, we must first gain an understanding of the different types of drugs and substances and their effects on the body.