In 1970 my high school buddies Greg and Phil had just gotten back from Vietnam. They were in the Marines. I had a vacancy in the house where I was living so I let them move in. About a month later, I got up early to go to work at my construction job. I heard a commotion in Greg's bedroom, the door was open, I looked in and they were sitting on the floor, shooting heroin. I just about fainted. I was shocked. These guys had never touched anything stronger than Jack Daniels in high school, but they got on the heroin in Vietnam.
Two weeks later I moved out, I wanted nothing to do with heroin addicts.

A year later Phil died of an OD. To my surprise, Greg got off the dope, but became a world class alcoholic by age 30. He did live to be 62 years old.