I've gone through six months of archived threads to see if this has been discussed before. If it's been done already, just lock the ♥♥♥♥ out of it, but AFAI can tell, it hasn't so here it goes.
This has long been a serious point for me, and a painful one at that. I've lost two (admittedly elderly) relatives to smoking-related deaths. It's one of my favourite (right word?) discussion topics, and one I think needs to be given serious thought.
So, should smoking be illegal? Tobacco-related death claims someone every six seconds, and kills just under six million people per year, of which 600,000 are nonsmokers. It is the number one cause of preventable death in the world.
Pros of smoking:
-Generates money from taxes (does not apply in countries with state healthcare, as a roughly equal amount is spent on curing).
-Makes you look cool (bad argument).
-Is hard to give up.
-Is part of a long tradition/ has been done for a long time.
Cons of smoking:
-Has a massive carcinogenic effect.
-Even if you don't contract active cancer, various parts of your body become gummed up with tar.
-Causes your teeth/nails to yellow, skin to stain, etc (bad argument, as this isn't a serious problem).
-Is addictive (making it illegal now prevents people getting hooked).
-ONE IN EVERY TEN PEOPLE KILLED BY SMOKING ARE KILLED BY PASSIVE INTAKE.
-Mothers who smoke while pregnant can cause their child to be born with birth defects ranging from major problems to minor lung damage to being born addicted.
-Children/teenagers who are too young to make responsible decisions can start, and have limited mental development throughout their lives.
EDIT: My opinion of smoking is that it should be illegal, if that wasn't obvious.
Here are some helpful links:
Wikipedia. World Health Organization.