A heroin addict found a couple of years back that their usual level of heroin intake, which had been working NICE-ly for a decade, was failing to deliver its usual kick.
They then experienced a junkie's crash, and found themselves looking face-up from the gutter.
To get out of this mess, they upped the heroin dosage, picked themselves out of the gutter, crawled onto the pavement, and got on with life again. Friends even said that they detected the 'green shoots' of a return to clean living.
The heroin addict told these same friends that they were now thinking about reducing their daily dosage.