I don't see why no one has tried to actually prove or disprove that one can play better while under the influence.
Someone that owns a table should set up a camera at their house, and record the following while sober.
1. Dr. Dave's BU Exam.
2. A race to 9 vs the 9 Ball Ghost.
Then over the course of x days, do the same thing but under the influence of a different drug each day. Start with alcohol. Beer the first night. Then liquor. Then both.
After alcohol, move on to marijuana and other drugs.
We'd probably need quite a few participants to get a bigger sample size.
Reminds me of the WKRP episode where they had the DJs drink and do tests of their reflexes to show how they slowed. Johnny's got better!