Dependence: This is when a person relies on a drug or alcohol to function normally. Without the substance, they may experience withdrawal symptoms.
Tolerance: This refers to needing more and more of a substance over time in order to achieve the same effect. It's like needing more gas for your car as it gets older and less efficient.
Withdrawal: This is the body's response when a dependent person stops taking a drug. Symptoms can range from mild discomfort to severe, life-threatening conditions. It's like going cold turkey after being used to having turkey every day!