Green Fairy

"The Green Fairy" - Elven Absinthe
Type: spirits, ingested
Addiction: moderate, Fortitude DC 16 Onset 1 day; Frequency 1/day Effect –2 penalty to Con and Str, target cannot naturally heal ability damage caused by the drug that caused this addiction; Cure 3 consecutive saves
Price: 500 gp
Effects: 1 hour; +1d4 Cha
Damage: 1d4 Con damage
Anytime a character takes a drug he must make a saving throw, noted in the drug's description, to resist becoming addicted. If a character makes the save, he is not addicted and the effects of the drug persist as normal. If he fails the save, he contracts the noted form of addiction. Should a character take multiple doses of the same drug in a short period of time addiction becomes more difficult to resist. The DC of a drug's saving throw increases by +2 every time a character takes a another dose of that drug while still suffering from ability damage caused by a previous dose. Keep track of how high this DC rises, even for characters already addicted to a drug, as it determines the DC necessary to overcome the disease.
Addiction manifests in three different degrees of severity: minor, moderate, and severe. Each drug notes what type of addiction failing a save against it results in. Each addiction causes a persistent penalty to ability scores, lasting for as long as the character has the disease. In the case of moderate and severe addictions, the character also cannot naturally heal ability damage dealt by the drug that caused the addiction.
Each form of addiction encourages sufferers to continue making use of the drug they are addicted to. While a character is benefiting from the effects of the drug he is addicted to, he does not suffer the penalties of his addiction disease. While he still receives the benefits of the drug and takes ability damage as normal, the disease's effects are mitigated. As soon as the drug's benefits expire, the disease's effects return.