Rabada, 22, already had five demerit points on his disciplinary record and earned three more for "inappropriate and deliberate physical contact with a player" following his clash with Smith.
"Australia were never going to give in easily so you had to go to the reserve tank and give of your best", Rabada said after being named man-of-the-match. "To be honest, I just let it out", he said.
Rabada failed to fully curb his emotions in the second innings two, giving Aussie vice-captain David Warner a screaming send-off despite having been charged for the incident with Smith.
"You could say that the contact (between Rabada and Smith) was very, very minimal". "I'm letting the team down and letting myself down".
The ruling therefore activates a two-Test ban, meaning Rabada will play no part in the forthcoming Newlands and Wanderers showdowns. "Honestly, I didn't feel contact in that moment". I was just flat, physically and mentally. I never tried to appeal that one because I knew that I did it.
"Yeah, it's bittersweet", Rabada said after claiming the fourth 10-wicket haul of his career.
"I take no pleasure in seeing a player suspended‚ particularly a young player of Kagiso's talent‚ but he has now breached the ICC code of conduct on a number of occasions", he said. Really good to see him in top form again. "I have to see it as a learning curve".
"I think I have probably been in all circumstances, I've gone too far with send-offs, and then other times where you pull it back, you know you have to be controlled", Siddle said on Monday.
The Proteas had a lead of 20 runs heading into the first session, but thanks to AB de Villiers, who finished 126 not out, and cameo innings from both Vernon Philander (36) and Keshav Maharaj (30), South Africa amassed a lead of 139.
Rabada took the first three of the five Australian wickets that fell for the addition of 59 runs on Monday. It is the joint-most 10-wicket haul by any bowler in Test history before the age of 23, along with Pakistan great Waqar Younis.
He was caught on camera swearing at Rabada after being dismissed early on the fourth morning.
Lyon had Dean Elgar (5) caught and bowled with the last ball before lunch and when Hazlewood removed Aiden Markram (21) shortly after the resumption, Australia sensed an opportunity.
Another option would be all-rounder Chris Morris, who won the last of his four test caps against England last July.
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