What you experienced with the smoothy is consistent with the proposed lemon tek theory: consuming the mushrooms with acidic beverages is considered a possible but not proven way to potentiate the trip and it could also qualititively change it if it does something to the pharmacodynamics and -kinetics of psilocybin hydrolysis.
Linky to subthread about the phenomenon: http://www.bluelight.ru/vb/showthread.php?t=224669
Linky to subthread about the phenomenon: http://www.bluelight.ru/vb/showthread.php?t=224669