QUOTE (Neraph @ Sep 26 2010, 12:17 AM)

I don't have to, you said it for me.
On the other hand, most drugs have a few built-in mechanics that make this a very, very poor decision.
1) Addiction. Both mental and physical. This would quickly lead to Burnout Addiction, meaning your character has about 4 months to live. On the other hand, you may choose this option while playing an Escaped Clone with Borrowed Time.
2) Overdose. Can = death quite quickly (P4MO, I'm looking at you).
EDIT: And actually, everything stacks unless explicitly stated that it does not in fact stack. They have to tell you Armor doesn't stack. They have to tell you that IP don't stack.
They actually DO tell you armor stacks, its in the armor rules.
IP is a strange but doable example, most items that grant IP can take you to the max quickly, but if you got something that adds +1, it will continue to raise the IP you have until it caps at 4. Im currently looking for rules specific to IP and will update this post if needed, if something would prevent it.
EDIT: You only take the highest
QUOTE (Yerameyahu @ Sep 25 2010, 05:35 PM)

Neither do I, so it's not. At my table. Easy fix, eh?

Neraph is simply pointing out that the RAW doesn't say it doesn't work.
As far as I'm concerned, no spell stacks with itself: identical sources never do, unless there's an explicit exception.Using lots of drugs and foci is expensive and risky. *shrug* If this gets abused in your game, just house rule it.
My suggestion is to stop combining DND with Shadowrun, the rule you are referencing doesn't exist in Shadowrun