Why do you think some people encourage others to smoke/drink?

In life there is stupid people whp just want to mess up others. They don't want to be alone and have company to smoke or drink with. Some people are smart enough to not get cought in the enfluence but some are not. Some think its cool but if you really think about it its a waste of time, and a waste of your life. I believe that drinking once in a while with a moderation is good but if you take it to far then you should probably think before you act. If you smoke, then you are plain out stupid because that messes up your lungs and can screw you up for life.