I had the same question run through my mind after giving to a homeless person. Then someone shared something with me that made sense. They said " give if that is what your heart says to do. Whatever the person does with it is on them". In other words, your gave with a loving heart. If the receiver uses it to feed his/her addiction, they have to answer for it themselves. Since that experience, I rarely give money anymore. I take the time to get them food instead if I'm near a fast food place.
Have peace in your heart knowing that you gave because you wanted to help.
Welcome to the Challenge. It will be an exciting experience. This community is so wonderful and the challenge stretches you. I will be looking for forward to reading your blogs.
Love and Light,