In hearings this week on tobacco regulation, Congress is likely to probe the tactics of some cigarette manufacturers, their targeting in ads of youthful and minority populations, and the accuracy or inaccuracy of disclosed nicotine levels and the health effects of such. All of that is proper. But Congress shouldn't forget that the element of personal responsibility for addictive behavior must also be weighed. In a free society, the government can demand openness and disclosure, but it can't protect people from themselves.