I don't think people here really expected this, which surprises me. Smart's calling card in college was either driving to the rim or shooting 3s (despite ~30% FG from here). Nothing in between, and the Celtics have made it clear they are actually ok with him shooting those 3s because it is beneficial for his development in the future. They've also commented that he has the "arc" to become a relatively successful 3PT shooter.
He had a 40-45% 3Pr in college, meaning 40-45% of his FGA attempts were from 3. On the other side, something like 45% of his attempts were at the rim. It is what it is, and I'm okay with it. ~30% from 3 is like 45% from 2. Seeing as he probably won't be able to hit 45% of his 16-23 foot shots, he probably has a better chance at hitting 30% of his 3s from a little further out, which has the side effect of spreading the offense quite a bit more.
This is why Sully and Smart (Rondo soon also probably) will continue to shoot 3s even if they are hovering around sub 30%. I've noticed a lot of people think shooting 3s at ~30% at higher volumes is bad shot selection. It really isn't honestly. Would you say 45% FG on your 16-23 foot 2PT jumper is inefficient? Probably not, right? That's why it's alright to step out a few feet and take the hit on your percentage. The bad side effect of shooting 3s despite their higher efficiency is more missed shots = more potential fast breaks. I'm honestly not sure how high the impact is here, though. You probably see one or two fast breaks a game based off of missed 3s. Even then, I feel like longer rebounds tend to go to the offensive team more often than the defensive.
This is also pre-season so I don't really expect Smart to have something like a 90% 3Pr like he did last night.