What is the highest Psychological Dependence, when Pleasure is less than 2.3, when Drug is "Cannabis", and when Physical Dependence is less than 0.8?
CREATE TABLE "addictive_potential" (
  "drug" text,
  "mean" real,
  "pleasure" real,
  "psychological_dependence" real,
  "physical_dependence" real
);
SELECT MAX("psychological_dependence") FROM "addictive_potential" WHERE "pleasure"<2.3 AND "drug"='cannabis' AND "physical_dependence"<0.8;