i use one of these when trying to be discreet, was at a brew house on my birthday and took some puffs of my "e-cig" (g-pen) did it probably smell like hash oil? probably, did i get away with it? yes. in my defense, i did try to ghost it....i really like it, its very low-key, you could use one to medicate in a non-mmj friendly state with less attention than a bowl or joint.