There's a lot of things in life that seem to give you a "+10" boost in the short term, and then gives you a mid-term "-1".
The first example to come to mind is consumer debt... you can get indebted at somewhere from 4% to in the 20 percents of interest. At 12% interest, you get $100 now, and then you pay -$1 to service interest every month until the balance is paid down.
That seems like not such a big deal. It's just a lousy dollar, right? And indeed, you can take any of the short-term-boost-suffer-mid-term interventions if the situation genuinely calls for it, and it's -- well, not good, but totally understandable.
Junk food works the same high. High calorie, low fiber, low nutrient junk food often gives you a boost to blood sugar and picks up your mood and energy. Well, that's in the short term -- you crash shortly afterwards, and wind up slightly less healthy than if you didn't eat that way.
You thus wind up in a funny situation where a lot of high-leverage situations would seem to call for one of these +10/-1 tradeoffs, and yet, people who make these tradeoffs constantly eventually wind up with serious problems. If you stack up enough usage of things that punish you in the mid-term and long-term, eventually you're taking short term boosts just to catch up and get back to normal, which is a tough place to be.