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Eating haram in itself is a very dangerous thing to do for the soul.
I will leave it for other more knowledgeable people to answer the details, but haram food should be avoided unless it is a matter of life or death, and even that comes with strict conditions such as not enjoying the food! Source: http://islamqa.org/hanafi/daruliftaa/8295

I found this for you regarding the dangers of eating haram food, hope it is of benefit.
Extracted from: http://islamqa.org/hanafi/askimam/5806

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Consuming halāl is an order of Allah and an essential part of the Islamic faith. Allah has repeatedly emphasised the consumption of halāl in the Qur῾an. Ponder over the following:

“O you who believe, eat from the pure things which we have provided you” (Quran 2:172)

“And do not eat that upon which the name of Allah has not been mentioned, for indeed it is a grave disobedience”. (Quran 6:121)

By being negligent about the dietary laws of Islam, one puts himself in danger in this world and the world hereafter. In this ephemeral world, the consumption of an unlawful morsel deprives oneself from having any of his good deeds and dū῾ā accepted. In the hereafter, his body will not be eligible to enter Paradise. All this is confirmed in the following ahādīth:

Sayyiduna Abu Hurayrah (radiallahu ahnu) relates that the Prophet (salallahu alaihi wasallam) said:

Verily Allah is pure and He accepts only what is pure and indeed Allah has given those orders to the believers, which he has given to the Messengers. He has said, “O Messenger, eat from the pure foods and work righteous”. He -also- has said: “O you who believe, eat from the pure things which we have provided you.” Then (the Prophet) made mention of a man who undergoes a lengthy journey in a state that he is dishevelled and dusty. He spreads his hands towards the sky (calling), “O my lord, O my lord”, however his food is harām, his drink is harām, his clothes are harām and he has been nourished with harām! So how will his call be answered?”[1] (Sahīh Muslim hadith number 1015)

Sayyiduna S’ad (radiallahu anhu) relates that the Prophet salallahu alaihi wasallam said “O S’ad purify your food (and as a result) you will become one who’s supplications are accepted. I swear by Him in whose hands the soul of Muhammad lies, verily a servant (of Allah) tosses a harām morsel in his stomach (due to which) no deed is accepted from him for 40 days”[2] (Tabarani hadīth no.6395)

Sayyiduna Ka`b Ibn Ujrah (radiallahu anhu) relates that the Prophet (salallahu alaihi wasallam) said, “a body nourished with harām will not enter Jannah”. (Tirmidhi hadith no.614)[3]

Sayyiduna Abu Hurayrah (radiallahu anhu) reports that the Prophet (salallahu alaihi wasallam) said, “A time will come upon the people wherein a man will not bother what he intakes; whether from a halāl source or harām.”[4] (Bukhari hadith no.2059)

In our times, it becomes even more important to ensure the meat and poultry consumed is genuinely halāl due to the excessive deceit, cheat and false labelling of halāl in the industry
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And Allah Ta’āla Knows Best

Mawlana Faraz Ibn Adam,
Student Darul Iftaa

UK

Checked and Approved by,
Mufti Ebrahim Desai.
www.daruliftaa.net
This is part of a longer fatwa, but i hope those hadith are very clear to you.