[Puppage]

Maybe there is a "crack gene" and a "methamphetamine gene" too. Who knows

That's a valid point

A disease implies the lack of a substance would kill or hurt you

Yes, but there's also mental disease is there not?

Lack of a substance in that case would not kill one because the disease is not for lack of a drug, ie crack, alcohol, etc. However, one could argue that the mental disease is due to a chemical imbalance yet those chemicals are not street drugs or alcohol.

[Stu Cohen]

Yes, but there's also mental disease is there not?

Yes, that is either cause by neurotransmitters (or the lack thereof) or congeneital brain defects.

Neither of which is a result of alcohol (unless the pregnant mother dranks).

Lack of a substance in that case would not kill one because the disease is not for lack of a drug, ie crack, alcohol, etc. However, one could argue that the mental disease is due to a chemical imbalance yet those chemicals are not street drugs or alcohol.

Okay, but to believe that, we have to believe that people are born with an "alcohol imbalance".