Maybe because they're overly-curious, they feel the need to "really get a feel of it" by trying it another time, or it's the only source of anything to keep their mind off of something. (Even if the effects of it do nothing for them, at least at first.)
All just guesses though.
That sucks that you can't get the cars you'd like, scanlator. I always wondered why people only choose dull colors for their vehicles, didn't know it's because people road-rage and vandalize at the mere sight of them. :worry:
I don't really like it when people get hit usually, but it felt so satisfying seeing a young boy in a public bath get hit for once. They're never not annoying in manga. :win: