Those smokers ha made it to be a habit for themselves that if they don't smoke while deficating, they feel they will not be able to bring out the waste product. Those smokers that wakes up from bed in the morning, first thing that they do is to smoke, have also made it a habit. Addiction is what controls their rate of smoking.
Smoking tobacco is dangerous to our health, and that has being a warning from onset. The government can only give awareness of the negative effects of smoking but cannot force anyone not to smoke. However, there are some benefits to smoking which only the smokers can tell you about.
I just imagine what those benefits could be that will override the implications of smoking. When you see people doing or enjoying a particular lifestyle, you can never tell what they feel or how their body react to that after using those substances on themselves. Most of this things were not just created without a purpose but the misuse of them have lead to more metal problems or inner damage of the body system than he should protect. I have nothing against those smoking, but watching your physical well being as to what extent it could be damaged if not stopped smoking should be a necessity to all involved.