In a group of people we are prone to have freinds who have certain habits that we may not enjoy as much as they do. Like smoking! So can a person who does smoke develop the habit of smoking, by just being around those who do? Is smoking contiguous? Also when dealing with people whith such habits, what is the best kind of intervention? Should we inform the family member or support our freind by doing nothing ? And when it comes freind it is often found difficult to even make them realise that they have a problem, so what are the best ways to deal with this?