CREATE TABLE table_name_55 (psychological_dependence INTEGER, physical_dependence VARCHAR(255), pleasure VARCHAR(255), drug VARCHAR(255))
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?
    
SQL: SELECT MAX(psychological_dependence) FROM table_name_55 WHERE pleasure < 2.3 AND drug = "cannabis" AND physical_dependence < 0.8