Your combo is... possible? Incoming opinion; my word is not one of the best on this forum as I'm not a top or even somewhat good player.
Anyways, it's really not what you should be doing with Smoke. You're spending a meter to end your pressure and take a chance at maybe (but probably not) mindfucking your opponent into another combo. If you really want to end a combo with 214 invisibility as a mixup every now and then, good on you if you can pull it off. But I would never ever EX it, at least not in that scenario since you're almost guaranteed to have to block a wakeup attack, and then you just lose the invis and have wasted it.
In terms of actually using Invis? I can't really say. I don't use it in my play, I'm far too busy with other things than to risk being exposed for a fuckton of frames to use a move that doesn't really do anything for me. The only use for it I can see is if you're a jedi and use it right as you're about to get hit by a projectile; you will actually sidestep it and it will pass by you while you go invisible. So it's a risk you can take instead of shaking.
And, as far as I know, Smoke doesn't have anything going for him in terms of rushdown frame advantage, he's neutral or negative on everything on block to my knowledge. NEVER EVER EVER DO 214 XX TELEPUNCH! (Unless you hit confirm it) You're just asking to get combo'd like mad. On block, I'll do the following with 214:
- 214 xx smoke drift towards
- 214 xx smoke drift away
- 214 > d4 > b23 xx bomb OR more d4 (mixup)
- 214 > sweep > hit confirm > telepunch (for free crossup and attempt at a meaty)
- 214 xx smoke bomb (many people stop blocking after the 4 and get hit by the bomb for a free combo.. dont make a habit of this one)
I used to do 214 xx invisibility as a combo ender in the corner, but I got blown up by a lot of wakeups doing that so I've stopped completely. Might be due to poor execution on my part being late though. I have no idea if that remains true midscreen since I never ever do it outside the corner.
Calling all better-than-me Smoke players! talk to this man. Teach me if I'm wrong on any of my advice.