Drugs

Shadowrun Fifth Edition Core Rulebook has some difficult to parse sentences in the rules for Addiction Tests.

Replace the second paragraph under Addiction Tests (starting with "Every time you") with:

Every time a character uses an addictive substance, they must make an Addiction Test against the Threshold from the Addiction Table.

• On a failure, they gain the Addiction Quality for that drug. If they are already addicted, the Addiction Quality increases by one level.
• On a success, they do not gain the Addiction Quality or increase any existing quality.

They are not out of the woods yet, however. Taking an addictive substance puts the character on a clock. They must make another Addiction Test 11-(Addiction Rating) weeks after the initial dose. For each week they've gone without taking a dose, reduce the Threshold by 1.

• If the Addiction Threshold is reduced to 0, no Addiction Test takes place — the character is free and clear.
• Otherwise, make an Addiction Test against the current threshold.
  • On a failure, they gain the Addiction Quality for that drug. If they are already addicted, the Addiction Quality increases by one level.
  • On a success, they do not gain the Addiction Quality or increase any existing quality.

Note that per the third paragraph (starting with "When it's time"), any time an Addiction Test is triggered (as described above), the character must make a test for every substance that has a clock running.

Remove Alcohol and Soykaf from the Addiction Table. If they were addictive in the same way drugs are, with the same eventual slide into Burnout, they would be among of the leading killers in the Sixth World.