Cocaine and crack cocaine users often become hooked on these drugs as a result of their first high. The intense feeling of euphoria when cocaine or crack is used keeps the user coming back for more, even if the consequences get worse over time. When a person uses cocaine initially, they may feel restless, anxious and irritable, feelings that increase as use increases. Cocaine and crack are both highly addictive street drugs to which thousands of people become addicted each year. People who use these drugs have feel as though they have more mental clarity when they are high because of the increased activity within the brain, however as they come down off the drug this feeling disappears and they are left looking for their next “fix”. People who use habitually may find that they have an increased tolerance to the drug, one of the first signs of addiction. Increased tolerance means that a person needs more and more of the drug in order to feel the same way they used to feel off of a smaller amount. If this habit persists, people find that they begin to crave and obsess about the drug – a sign of initial physical and mental addiction. Increased tolerance and dependance on cocaine means that if the person stops taking the drug they can experience painful cocaine withdrawal symptoms. In many people cocaine use results in decreased desire for food consumption and can lead to health problems, eating disorders and fatigue. Depending on the way that the drug is used (snorting, injecting, smoking), it can have varying effects. If a person snorts cocaine he/she may have regular nosebleeds and problems with sensory perception in the nose and mouth. Eating cocaine can cause bowel problems whereas injecting it may cause unpredictable reactions and increased risk of contracting intravenous diseases. People who smoke crack tend to have oral problems such as expedited tooth decay and sores as well as respiratory problems.