Do you think people ever change?

I believe that people do change but some just stay the same. Some people can do drugs and then if they try they can stop doing drugs and become ambitious and hard working.
A person that does drugs and just say they going to change and people and family members that try to help and think they going to change and they just keep on the same.
for example my friend Kristina`s uncle was on drugs and her family try to help him quit and after awhile he did but he went back with the wrong crowd and started it agina. A example for changing my aunt from P.A smoked ciggerates and she try her best to quit so she got the things to help her quit like the gum, and patch and she felt it didn`t work but she kept on and she quit (Now she has better health....So she changed!!!)