If you want his actual opinion on it, read his marvelous dissent in
Gonzales v. Raich. Anyone who has the opinion that Thomas is simply a token should probably read his dissents. They generally represent a coherent Constitutional philosophy and he has been quite consistent about it.
Gonzales incidentally is a medical marijuana case, and Thomas's view, consistent with his prior opinions, is that
Wickard v. Filburn is simply wrong and he would overrule it, but specifically, that the federal government has no right whatsoever to outlaw marijuana or any other crop under the basis of "interstate commerce," especially when the commerce remains entirely within a state or within the control of a single person in his own home.