Prophet SAWS (peace be upon him) said:
“A person will not be able to move on the Day of Judgment until he is asked about … his body as to what he engaged it in.”
Allah says (interpretation of the meaning) in surat al-A’raaf (7:157):
“And He makes good things halaal for them and bad things haraam.”
“Do not kill yourself. Allah is Merciful unto you.” (Surat al-Nisaa’ 4:29)
“Those who cause harm to believing men and women without any reason do a great sin.” (Surat al-Ahzaab, 33:58)
“… and do not be extravagant wasters. Those who are extravagant are kinsmen of Satan.” (Surat al-Israa’ 17:26-27)
Extravagance (in Islam) means spending on something haraam.
Spending money on cigarettes is a waste of resources as well. The Prophet SAWS (peace be upon him) said:
“A person will not be able to move on the Day of Judgment until he is asked about … what he owned as to how he spent it.”
The ones who survive.. would it be valid to consider them as sinners?
So weather you die bcoz of it or not it is a great Sin.