[Faceman]

I DO agree that a lot of people argue on a lot of issues without sufficient information and/or experience but that does NOT exclude them from the right to have an opinion and it does NOT make them automatically wrong.

As for losing temper: I assume we are talking about "what is right" here not about "what is common". I don't consider it a very good argument to say: "I hit my child because sometimes I can't help it".

With that logic you could easily say that smoking is a good thing: "Wait until you get addicted and let's see you talking all reasonable about quitting then!"
The fact that you are to weak to stop does not make it right and the fact that your friends did not smoke in the first place does not make them wrong trying to make you quit.