faddist

noun

1. A person or entity given to following fads.

   “He is such a fashion faddist.”

   “The faddist magazines have been hyping that lately.”

   “In speaking thus somewhat emphatically I would not wish to be classed as a faddist on the question of sanatorial treatment because personally I am of the opinion that sanatorial institutes are not the permanencies that many would have them be in the treatment of pulmonary tuberculosis […]”