Consequences of sinning:

- It destroys an individual's heart and body

 - When individuals commit sin,  it weakens and reduces the magnification of Allah, the Mighty in the heart of the individual. 

 -By sining, we remove the servant from the realm of Ihsaan (doing good) and he is kept from (obtaining) the reward of doing good actions. 

 - Ali (radiallahu 'anhu) said: "No trial has descended except due to a sin and it (the trial) is not repelled except by repentance."  It causes the favours of Allah to cease and justify His retribution.

 - It corrupts the intellect. The intellect has light and by sinning we extinguish this light. When the light of the intellect is extinguished it becomes weak and deficient.

 -The servant continues to commit sins until the sin becomes easy for him to commit and seem to have no regret after sinning. Ibn Mas'ood (radiallahu 'anhu) said: "Indeed, the believer sees his sins as if he was standing at the foot of a mountain fearing that it will fall upon him and the sinner sees his sins like a fly which passes by his nose so he tries to remove it by waving his hand around." [Al-Bukhari  

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There are way more consequences of committing sins but these are the few that I think are important for us to know.