I guess anything in excess will kill ya. I don't think I would worry to much about the BBQ grill tho. There are a lot more dangerous things out there like fast moving boats and cars. Car accidents kill more people every year than cigarettes do but you don't see people being paranoid about driving. I am not defending cigarettes. I don't smoke. I just don't think BBQ smoke is a high priority health hazard.
Cant compare a house fire to a BBQ. Most people who die of smoke inhalation in a house or business fire are over come by toxic fumes from plastics, rubber, chemicals and items such as that, not burning wood or charcoal.