From what I've learn and study from friends, during my free time and during school, other than playing with music, that,
Heavy smoker, most likely to harm their health like no tomorrow. Hence hurting their body, faster than a passive and/or light smoker.
While Passive smoker, will be hurt their body faster than a light smoker because what they are breathing in from second hand smoke, are bound to be very deadly, because those smoke are harmful released smoke/gas. And their body can't really adapt.
While Light smoker won't be hurting their body that much, because the body have that adaption, hence is like something like doing it before. Got license liao.
Hope it makes sense. Do correct me if I'm wrong. And oh, no offence! :mrgreen: