Cocaine is a stimulant which temporarily speeds up the way your mind and body work but the effects are short-lived. Cocaine is more commonly snorted whilst crack cocaine is generally smoked in a pipe.
Crack tends to have a much stronger effect and can be more addictive than snorting cocaine. Cocaine and crack both effect the levels of dopamine in the brain (a natural chemical which is released when we are happy or having a pleasurable experience) which give users a high. However, long term use of these drugs mean that we have less dopamine in our brains leading to low mood and even depression.
The effects of cocaine/crack can include feeling confident, alert and energised, however the come down after using can result in not being able to sleep, feeling agitated and low mood.
It raises body temperature and makes the heart beat faster which can lead to heart attacks.
If you share pipes or notes (tubes) to snort with there is a possibility of transmitting blood borne viruses such as HIV or hepatitis C.
The come down can leave users feeling tired and run down. In some cases, feelings of depression after using can lead to thoughts of self-harm and/or suicide.