I have a friend who avoided doing the military service back when it was compulsory in spain.
The day previous and the morning of the physical test, he smoked like cigarrette after cigarrette (he isn't a smoker). When he had to run to test his physical aptitude, he was unable to do the minimum time that was required for recruits (actually he was coughing to death after a few meters) so he wasn't recruited.