Olfactory stimulants have little to do with it - that is the experience of the artist and artist only. It has no effect on the viewer.
If experience of the artist at the time of creation had an effect on the viewer, the greatest artist would emerge who'd sandpaint with cocaine powder and the viewers would be ecstatic because the artist pushed off in the process. It doesn't work like that, unfortunately.
Dali's choice of medium is not his accomplishment. It is the message and the influence on the viewer that counts. Deliver the message, conceal the artist?
If Dali had chosen to paint watercolor, he'd have less texture... the pictures would still convey the message.