I have noticed these tendencies in myself over the years:
When I"m waiting to receive a new piece of gear in the mail, I take fewer pictures with the gear that I already have than I did before purchasing the new piece.
And when I consume alcohol, my creativity is numbed and I become uninspired to take pictures even when I see something interesting.
And when I smoked (years ago) non-tobacco cigarettes, I thought everything was interesting and would take copious amounts of pictures, only to find out later, once they were developed, that there really was nothing interesting.
And stress from work or family life is detrimental to my photographic creativity and production.
Anyone else care to add?