Sense of smell

Science fiction is full of technologies related to sight and hearring.  Well, mostly for sight and hearring.  I am not an expert nor a connaisseur in the topic.  I know more what is in pop culture like hologram, holodeck, communicators, transporter, universal translator and I know that I must have forgot about many things. Those marvelous technologies serves the most common sense like sight, hearring, voice/speach or being displaced quickly from one place or other.  The sense of smell seems to be a looser when it comes to technologies.  I don't know of technologies that involve the smells

Of course, it is something a bit far fetched.  The sense of smell may be not an success in a science fiction story.  it can be leave scraches heads for a use of smell.  Could be fun to come up with a technology that can pick up pheromone.  It would be fun to have a conversation using smell.  Too sad the technology for that knid of communication would be hard to miniaturize.  I also imagine how hard to get recharges for smell producing part.  The source of scent could be essential oils.  I know a little can go far and it is true of essential oils.  The problem happen if there is an extensive use of that technology.  I could imagine a big thank full of essential oils just to have essentila oils under hand.

Having some technologies involving smell could be fun.  Not really useful because I don't think it would save the world.  I don't know if extra-terestial have a sense of smell.  If they have one, would be hilarious to scre them with an ugly smell.  I can see the main character sending an bomb with the smelliest and ugliest smell bomb to his enemy.  It should be a powerfully smelly bomb in the whole universe.  Doing a battle scene in those conditions would be quite ungly, not a aesthetic and choreographed scene like in Crouching Tiger, Hidden Dragon (https://www.blogger.com/blogger.g?blogID=2758842815612261477#editor/target=post;postID=715019793353096623;onPublishedMenu=allposts;onClosedMenu=allposts;postNum=0;src=link)