Hey guys,

I'm running a chemist and I had what I hope is a quick question on mixing drugs.
The only reference I can see to it is on pg. 78 of Arsenal.

Habitual users oft en develop a tendency to “speedball,” or
mix drugs in order to increase the level of their high. Speedballing
is more addictive than taking drugs separately. Characters who mix
drugs receive a –1 die penalty to their Addiction Test for drugs
that they have mixed.

Are there any other rules for mixing drugs?
Can you drop more than one dose of something? Would 2 hits of Jazz give me 3 IPs?

If I were to mix deepweed, jazz and psyche...would that just be a -3 dice pool on the addiction test?
I can't seem to find anything else on side-effects.