How do I handle a friend who is a drug addict?

Can you answer ann h’s question about Addiction?:

I haven’t seen my friend who I think is a drug addict for over a week. He often comes to my door and asks for money and always has some sob story to guilt me into giving him money. I know he has lied to me repeatedly,but like a total idiot I gave into him last week,and gave him money. I am really afraid he will be back. I don’t want to call the police on him,but I want him to quit harrassing me. What advice would you give me?

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