in an arranged marriage if you was to ask a guy "have u ever drank alcohol" what will his answer be"no". have u ever bunned weed? "no" all the answers to ur questions will be what u wanna hear, then once they get what they want the truth all comes out....
there are pointers in this post for guys and girls, what i have observed, all the smokers in UK do take drugs while smoking regular or occasional but whoevere smokes they do that. and the people who do drugs, commonly also drink too!
although addiction never leaves any1 but there are various ways of finding out the remedies as at times there are other factors involved in such evil habits. once u r married u can quit without any strong reason as such habits may b there in every 2nd person in nowadays' world and one should investigate fully all the matters bfor marriage.
if u explore later try 2 find a mid way out. if the reason bcums more significant then dcide the end bfor having any kid.