Not sure this is the correct forum for this topic, which seems to fall between the cracks.
I will start us off by saying mine is JT MegaSteam and my favorite scent of theirs is Cut Grass.
Arnold
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JT’s grandpa’s pipe smoke.
Gene
Mega Steam is my exclusive smoke fluid provider.
In diesels I use “Nada”, in steamers “Coal Fired Steamer”, and from Thanksgiving through the end of the Christmas season I use “Cranberry Woods” in all my locos.
Challenger only one that smells like AMERICAN FLYER.
JT's Mega Steam "Coal Fired Steamer" all the way......
If they ever come up with "2-Stroke Outboard Motor Exhaust" or "Deep Fried Turkey," I'd go for those as well.
Mega Steam Hot Chocolate, Popcorn and Christmas Pine.
JT's Coal-fired steamer. I hear cinder is also very nice, just have not had a chance to try it yet. Lionel NADA in my two diesels.
Mega-Steam Eliminator because it smokes so well. It is great for demos and some people actually like the (citrus?) smell but it is more expensive than other Mega-Steam products.
50/50 Mega-steam wood stove and holiday bayberry.
I think someone on this forum recommended this scent years ago.
Bayberry and Christmas pine.
MS is good, used Nada. But the newer Lionel fluid works just as well.
Mega-steam Original Cedar
@NJCJOE posted:Hmmm, let me see...
Good grief, Joe........are you the northeast territory sales rep for JT's?
I try. 
I like the smell of coal. Smells realistic.
John
J.T's Mega Steam " Cinnamon Roll".
JT's Coffee
JT’s Vanilla……
Peter
JT's Maple Sugar
Lionel post-war smoke pellets (aka no scent)
Mega Steam Cranberry Woods - train room smells like a nice Yankee Candle 
- try it
Christmas Pine for me.
