Drugs

Shadowrun Fifth Edition Core Rulebook (p. 414) has some difficult to parse sentences in the rules for Addiction Tests.

Replace the second paragraph under Addiction Tests with:

When 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. On a success, they are not addicted.

My interpretation of it is as follows. You use a drug, thereby entering "week 1". (The rules aren't clear on where in the week you are. though: the first day? the last day? If you use the drug again 6 hours later, is that in "week 2"? Perhaps Sunday is Addiction Test Day?) "Decision week" is set as week (11 - Addiction Rating): that can range from week 10 for soykaf, all the way down to 2 for Kamikaze and Nitro. (Technically, it's every multiple of that number, by the way - so weeks 2, 4, 6, etc. for Kamikaze/Nitro, and weeks 10, 20, 30, etc. for soykaf.) At the end of each week, you follow a few steps: Did I use the drug at any point during this week? Yes: reset Addiction Threshold to the initial value. Carry on with the next step. No: the Addiction Threshold goes down by 1. Is it 0 now? Yes: you're in the clear! No need to keep track anymore. No: carry on with the next step. Is this a "Decision week"? Yes: Make an Addiction Test (2 if the addiction type is both psychological and physiological). Did you pass the test (or both tests)? Yes: congratulations! You didn't get hooked this time, but until the Threshold hits 0 or you get hooked, you'll have to continue keeping track of this. See you next week! No: you're now (even more) hooked. No need to keep track anymore. No: see you next week! I hope that makes things a little more clear. Of course, since a picture is worth a thousand words, you could flowchart it and rub the flowchart in people's faces when they get confused (or when you want to go "Look! I have a flowchart!"), if you want.

Remove "Soykaf" from the Addiction Table. If it were addictive in the same way drugs are, it would be one of the leading killers in the Sixth World.