I also used hallucinagens (a few times) in my youth (the 80's) and found after only 2 or 3 uses that I had flashbacks when I smoked pot. Hence the end of pot and all drug use for me (a good thing, I suppose). However, with the disclaimer that I am very new to this and uneducated, I would suggest that if you feel like you "lack substance" you might want to eat a bit more of something with substance, say, animal protein or a bit of oil. Please, mb counselors, chime in to give more educated opinion.
--Meeso