Do drugs keep you from growing?

No, but other things happen to your body. You upset the chemical processes in your body, you damage brain cells, you may hurt your chances of having children because of lack of hormones, if cancer runs in your family you may damage cells and get cancer when you are older, different organs in your body are damaged, it could stop the brain/heart process and cause a heart attack. This is just a sample of what taking drugs will do for you. Not to mention the addiction.