The highest pronounced differences in smoking are racial and ethnic. the centers for disease control (2012) reported that the group with the highest rates of smoking is:

Smoking problem has not always been attacking one ethnic group but lurks on many. Some of the ethnic groups that are included in the top seed of users are whites, african-americans, hispanic, american-indians, american-asians. The top users among these are the american indians or Alaska natives.

I would judge them because I know for a fact that they know that what they just did was wrong and I would ask them to pick it up.