Smith, who is married to actor Will Smith, said that she has had her share of struggles, including "many addictions, of several kinds."
"What I learned about myself is this, when I was younger I was not a good problem solver, meaning I had a very difficult time with dealing with my problems in life," she said.
"But today, at 42, I have my wisdom, my heart and my conscience as the only tools to overcome life's inevitable obstacles. I have become a good problem solver with those tools, and I am damn proud."
"What I hope is that we all continue to gain healthy understanding that life is really about, solving problems, and also about us learning to become masters at solving them."
Her post comes shortly after speculation that she and her husband were splitting up. In a recent interview, though, she said that she has been able to avoid the rumor mill.
"I have been affected by gossip and I know people who have been too. I've seen marriages destroyed by gossip. It is cruel," she said.