I have been using smokeless tobacco on and off for years. I thought I quit numerous times but I now realize that wasn't really the case. You can say that I merely stopped using for periods of time. The difference now is that I finally quit, meaning that I am done and will not start again. I'm well over the hump.
A megabyte is one thousand times larger than a kilobyte. The prefixes mega- and kilo- are used by a metric system of counting which is based on powers of ten. Mega comes from a Greek word megas, which translates as great. In metric systems, mega- denotes one million.
Okay, now is the classic question. First, MB is bigger than KB. Depending of the use you might take, 1MB is equal to 1024 or 1000 KB. But the exact one if 1024. The simple reason is that in the computer, 1 Kilobyte is repesented as 2^10 while 1 Mb is represented as 2^20.