There are different brands of cigarettes and some of them contain more or less nicotine and tar level. So does that difference make one or other safer or not.
No. "OMar" and "Vulcan" are correct.
Studies have been done proving that low tar and nicotine cigarettes
do not lower the risk of the many smoking related cancer types.
http://www.cancer.gov/newscenter/pressreleases/2001/lowtar
http://www.cancer.gov/cancertopics/factsheet/Tobacco/light-cigarettes
http://quitsmoking.about.com/od/cigaretteingredients/a/lightcigarettes.htm
http://www.stopsmokinghelp.org/1006-low-tar-cigarettes.html