The leaves of the coca plant can be chewed or made into a tea and drunk. Coca leaves are used this way legally in many countries as a mild stimulant similar to caffeine. Most often cocaine is snorted in small lines. The effects come on gradually and peak after about 15-30 minutes. When injected, the effects are felt immediately and much more intensely.
Cocaine is a stimulant drug like speed, but much shorter acting.
It causes a sudden increase in heart rate, blood pressure and breathing. It also leads to feelings of confidence, alertness and euphoria. This can lead to using too much or too often. Many users become compulsive in their use of cocaine, which can lead to physical or psychological addiction. The after-effects can include depression, agitation, anxiety and paranoia.