Controlled substances are those substances which have a potential for abuse and are thus regulated by the Federal government. These can be pharmaceutical substances, prescription medications, or illegal "street" drugs. The government's power to regulate these is derived from the Controlled Substances Act of 1970 and is generally enforced through the Drug Enforcement Administration and the Food and Drug Administration.
Risky behaviors, although not illegal for adults, are those which can lead to significant health risks per their abuse or prolonged use. Many of these are lifestyle choices and include using tobacco, excessive alcohol consumption, and abuse of prescription drugs. These behaviors are those that have the recognized potential to pose serious health risks. A broad portion of the laws regarding these behaviors are aimed at protecting children from exposure to, acquisition of, and use of these substances.