Bad company can be said to be having a set of immoral friends and taking after them, just as they are to you. Having a bad company can occur in different ways, depending on what you do most, where you are and your activities in such places like school and home .
The major effect of bad company is loss of interest in studies. Bad friends do not encourage a person to take his her studies serious, all they could do is either teach one how to drink and smoke or prostitute by taking one to sugar daddies or mummies. If it is for a girl, she is likely to get pregnant and at the same time contact Hiv and Aids and for a boy, he is prone to becoming a drunk, as well as contacting Hiv and Aids which can ruin his future completely.
Bad company can also make a student to accommodate arrogance as his or her paramount behaviour towards the school authority. This could be by breaking the school rules and regulations in ways such as coming late to school, fighting classmates for unreasonable issues, rudeness to teachers in the school and even leading in school fight against other schools, not knowing that such act could make one to be suspended from school or even expelled if care is not taking. This of course will mark the end of the persons education and such a child can become a criminal and a threat to both his neigbhourhood and country.
Bad company can bring about the initiation of a student into secret cults. This always involves taking the lives of others intentionally.
I want to advise you to look and study before you choose your friends. This is because there is an adage which says: show me your friend and I will tell you whom you are. We should try to know the kind of friends we are having, before they influence us with their bad character. Also, I will like to advise parents to please teach their children good moral behaviour. In the case of manners, most students do not exhibit the attitude of well trained children. It is important to call them to order whenever they are bringing up the attitude acquired from bad company.