I Don't Do Drugs

People I've known since I was really young have all turned to drugs. A very good friend of mine was recently kicked out of his house because of it. Another friend (a guy I've known since I was born) only calls or texts to ask for money, money he knows I won't give him. It annoys me, no, angers me to see great people destroyed by drugs and the like, people who I thought were above that are the people who take part in it. Maybe I hate it because I don't get it, but I don't want to get it. Why would you destroy yourself like that?