Stimulants. Oh, Haruhi, stimulants.
They're so damn fantastic for what I like to do the most - Writing, listening to music and masturbating. The euphoria they deliver is also a factor, naturally. It's so strange, my relationship with them. I dislike them, kind of, because they can be very cruel to me - Making me behave like a fool, and causing me to act in ways I wouldn't, missing sleep and such. I honestly can't recommend them to anyone - Their cruelty is too much, in my honest opinion. Such a little risk-reward factor. I despise them, and I love them.
My waifu would regard me as human trash for this weakness of mine, and I love that more than anything about her.
I don't care to stop because as I said, they're good for what I do, and they manage to put me in a relatively positive mood.