The bit about addiction being mandatory makes me think of Sheckley's The Status Civilization (1960).
The protagonist is Will Barrent, who was convicted of a crime on Earth, mindwiped, and shipped to Omega as a prisoner.
One night there was a heavy knocking at his door. Half asleep, Barrent answered it. Four uniformed men pushed their way inside and told him he was under arrest.
"What for?" Barrent asked.
"Non-drug addiction," one of the men told him. "You have three minutes to dress."
"What's the penalty?"
"You'll find out in court," the man said. He winked at the other guards and added, "But the only way to cure a nonaddict is to kill him. Eh?"
And the judge explains:
"For the present," the judge said, "your religious impiety can be waived, since it is a first offense. But non-drug addiction is a major crime against the state of Omega. The uninterrupted use of drugs is an enforced privilege of every citizen. It is well known that privileges must be exercised, otherwise they will be lost. To lose our privileges would be to lose the very cornerstone of our liberty. Therefore to reject or otherwise fail to perform a privilege is tantamount to high treason."
Barrent survives the Ordeal (a murder machine) that is the punishment for his non-addiction, but continues to be a non-conformist and is selected for the Hunt, where troublemakers are marked as prey for citizens to kill. He survives the Hunt, for which is prize is to be entered in the Games, which are gladiatorial in nature and take place in the Arena.
Barrent lived through the hand-to-hand duels in which a quarter of the prisoners were killed. After that, men armed with swords were matched against the deadlier Omegan fauna. The beasts they fought included the hintolyte and the hintosced—big-jawed, heavily armored monsters whose natural habitat was the desert region far to the south of Tetrahyde. Fifteen men later, these beasts were dead. Barrent was matched with a Saunus, a flying black reptile from the western mountains. [...]
He moved back to the reserve pen and watched other men struggle against the trichomotreds, incredibly fast little creatures the size of rats, with the dispositions of rabid wolverines. It took five teams of prisoners. After a brief interlude of hand-to-hand duelling, the Arena was cleared again.
Now the hard-shelled criatin amphibians lumbered in. Although sluggish in disposition, the criatins were completely protected beneath several inches of shell. Their narrow whiplash tails, which also served them as antennae, were invariably fatal to any man who approached them. Barrent had to fight one of these after it had dispatched four of his fellow prisoners.
But Barrent survives both this and the carrion tree that consumes everything else in the Arena; his final reward for surviving the Games is to be consumed by the Black One, but it is not what it seems. He ends up recruited by a different group of criminals to make an exploratory effort to return to Earth.