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Don't you see the fallacy here. Tobacco was carved-out primarily because of their unreasonably aggressive lawsuits and not because tobacco is unhealthy. Using reason, we should ban either all companies, because all companies have the power to abuse the system, or ban all companies that are producing arguably unhealthy products. They did neither of those.

Does the TPP include a provision to stop Oil Companies suing over any future regulation to reduce CO2 emissions ?

This is just a "positive" aspect of the TPP so that you can say it has positive things in it. Surely it has a lot of caveats for other industries, companies/lobbies. Typically corporations have lawyers working for them full time.