Coke and crack are both addictive substances and are quite similar in terms of how they affect the body system. Coke is just another way of referring to cocaine, and after it has been taken, it takes about 15 minutes before it begins to react with the body system.
In contrast, the crack doesn't take up to 15 minutes before it mixes with the body system. In fact, it does not take up to 20 seconds before it begins to react with the body system. Due to its instantaneous effects, it is usually preferred to cocaine by those who want to get high faster. However, those who are aware of the negative impacts of crack usually prefer cocaine to it.
For instance, when you take a crack, it takes total control of your actions and thoughts. Crack is usually considered as a newer drug compared to cocaine. Another difference is that crack is cheaper than cocaine. The reason for the higher price of cocaine is because it is difficult to get.