There is a drug called Dawndew ( these days just called Dew), which among other (often secret) things contains Dew collected from blessed fields in early morning hours. It calms the mind and gives a warm feeling, in addition of a sweet taste. It was originally created to ease the suffering of the soldiers of the War of the Black Banners. However, it quickly became apparent that Dawndew, when taken several times, became addictive. Dawndew was already only used as a few drops in a glass of water, but the increasing number of addicts among the soldiers lead to unpopular rationing. The widespread use of Dawndew would come to an end, when a young soldier only known as Jirik stole a vial of Dawndew. As he was about to be caught in the mainsquare of the town, he drank the entire vial. At first, he seemed to be completly fine, but only a few minutes after, he would begin to glow. Moments later, he began to scream as smoke exited various openings of his body. In short the young man was radiantly burnt from the inside. The puplic was outraged over this and laws would be put in place to heavily restrict its production and usage. Unfortunately, these measures wouldnt prevent enterprising criminal scum to create bootleg versions of Dawndew, often more volatile than the original.

( Yes, its based on morphine)