can be reached by the smith-morra gambit a tempo up for black
If you know anything about the caro-kann...

can be reached by the smith-morra gambit a tempo up for black
Problem with that is it relies on white playing the smith-morra. The advanced variation of the caro kann is one of the most popular for white after black plays c6 for the caro.

This is known as the Botvinnik-Carls Gambit, according to "Complete Defense to King Pawn Openings" by Eric Schiller

As the Caro-Kann is my main defense, I face the Advance Variation a lot and really enjoy 3...c5. I've never really felt a 'rush' to play c5 so much as simply enjoying the positions I receive with this move while not feeling that level of happiness with 3...Bf5. Unfortunately, I'm in a class so I can't type as much as I'd like, but I can certainly say that it's a sound deviation from main-line theory.

Alas, but fifteen minutes until this IST class begins! 3...Bf5 has always, to me, been mainline theory, while 3...c5 was a popular novelty/variation to get away from it, like the Alapin Sicilian vs. the Open Sicilian.

its been noted to be with this variation, to give an advantage to white, theres an EVERYMANS chess book noting this by Joe Gallegher on this in which he says such, if you want to learn lines go to www.365chess.com for games
It is better to play c5 later on, as this position is like an advanced french, except without a tempo and a pan on e6. Bf5 or Na6 are both very good.

I'm not exactly getting defensive so much as putting my thoughts out there; I really do enjoy 3...c5 while I fear 3...Bf5, mostly because of the bulk of theory after 4.Nc3 intending a quick g4. No offense is taken in the least - that'd be like a Najdorf player getting ready to throttle a Scheveningen player who's using Kasparov's move order!
I do want to study 3...Bf5, but at the time I was advised to learn little theory and simply thresh things out over the board. Now I'm a bit afraid to begin learning the large amounts of theory when I can avoid it with a strong sideline. :(

I used to play this gambit but gave it up because my repertoire book, for some reason, gave no lines for if white accepted .. I moved onto ...Bf5. It's a powerful line for black.

The way I learned theory was just... learn a starting position (hopefully not too deep) and then play-play-play. My weak point is probably studying master games; I really don't understand them and have trouble translating their ideas, whether to my head or the board.
Perhaps I /should/ learn 3...Bf5, though 3...c5 will remain my main weapon, if only for familiarity and until the edge on it dulls. Thank you so much for sharing some useful information!
What do you think of this idea in the advanced variation?