There is some type of crusade against alcohol and tobacco in the US. The prohibition failed for a reason though. The cigarette company ads have been banned from television all together. There is no real reason for this. Primetime is not children's television, alcohol and tobacco both should be allowed to air commercials when they like.
No, alcohol and tobacco advertisements should not be shown during primetime, because they cause too much harm. If a person lives with an alcoholic, seeing or hearing about alcohol is very disturbing for them. If a person is trying to recover from addiction, seeing adds for alcohol will not help them. It is better to save those advertisements for other times and places.