Lawful and Unlawful Money Mixed
Question

                What should a person do with the profits he made from selling cigarettes, when it has been mixed with other lawful money?
Praise be to Allah.
    He who has 
    done business in things that are prohibited in Islam, such as musical 
    instruments, prohibited cassettes, cigarettes etc. while knowing the ruling 
    on them then wishes to repent, needs to give away in charity all the profits 
    he made from them. This will be a means of purification and will not be 
    counted as spending in the way of Allah, for Allah is pure and does not 
    accept but the pure.

    Further, if 
    this money gets mixed up with other earnings, as in the case of a shop owner 
    who sells many other items, then if he can compute the amount of profits 
    made from them, he should do so in the hope of purifying the rest of his 
    earnings.

    In other 
    words, he who has some money earned through unlawful means and intends to 
    repent, should:

          
    1- If he was an unbeliever at the time of earning the money, he is not 
    obliged to atone for them or seek their purification. For the Prophet (peace 
    and blessings of Allah be upon him) did not demand from his followers that 
    they purify their wealth after coming into the fold of Islam.

          
    2- If he was Muslim at the time of earning the money, well aware of its 
    Islamic ban and prohibition, then he should separate it out at the time of 
    repentance.