Can laxative abuse or over use of laxative cause colitis.?

Yes. Why laxatives have to be abused, first cause of the constipation is to be determined by your physician , by exam and tests including colonoscopy for malignancy , anorectal motility studies.Some laxatives that stimulate the colon like seneca etc by constant stimulation colonic mucosa will be damaged permanently and may result colitis.
Not really. Laxative use should be directed by your doctor. Needing laxatives for more than two days should prompt a visit to your doctor.