In summation: Crack is just another form of cocaine, mixed with a weak base that changes its composition into a solid form, commonly known as "rocks."
Crack gets its name because of the sound it makes when heated.
Crack, which is inhaled directly through the lungs and into your bloodstream, reaches the brain in just eight seconds. Much faster than the ten minutes it takes for cocaine to reach your bloodstream when snorted.
But when cocaine and crack hit the bloodstream, their effects are exactly the same.