Because I noticed that the worst chain smokers in Nigeria are northern Muslims.
From the small children to the toothless grandmothers.

Afghanistan, a Muslim country is also the the grand cultivator of opium, the raw material for heroine with addicted kids.
Iran, another Muslim country has one of the highest drug addiction rates in the world.
Is allah only concerned about alcohol and pigs?

Allah is cool with it.

Hint:
The OP should be in Islam for Muslims sub-forum.

My reply is gonna be based on two things: First one book I read sometimes in the past titled Why Do You Smoke? And The Islamic Ruling on Smoking.

Cigarette smoking first came to light in the Islamic States towards the end of the hundred and tenth year of hijrah. The first people to import it were the European Christians [Ali Hassan Ali Abdul Hameed (2006)]. This means that cigarette smoking did not exist during the time of the Prophet Mohammad (peace and blessings be upon him), but the great religion of Islam has laid down general principles from which many laws are derived.

Many Muslims scholars with the capability of Ijtihad (deriving verdicts in new situations) issued several Fatwas. All but two of these fatwas make smoking strictly forbidden, while the other two say it ranges between strongly reprehensible, i.e. makrooh, and forbidden. Many other scholars have subscribed to these fatwas and the number is always increasing. No scholar has ever revised his ruling of prohibition on smoking, while many who used to be reluctant to issue such a ruling found it necessary to change their mind when they knew the full extent of the danger tobacco smoke causes to the health of the smoker and those who are in close proximity to him.

Its reported in a popular hadeeth the Prophet (p.b.u.h) saying: “Halaal and haraam are evident and between them (halaal and haraam) are doubtful things which many people are unaware of”.

Thus we can see glaringly obvious that which is halal is beneficial and that which is haram is harmful. Which can you categorize cigarette as? Harmful, of course. Right?

Will write more, inshaAllah, later.