The frequency of use of tobacco by males and females vary. Among students who smoke, females are more likely to be frequent smokers. College students who are frequent users of tobacco generally started smoking at an earlier age than infrequent smokers. The number of former smokers has decreased during the 1990s. Students perception of the number of students using tobacco is much higher than the actual level of use.
Tobacco use is linked to poorer academic performance.
Tobacco use is linked with marijuana use. Tobacco use is tightly correlated with alcohol use. There is a strong correlation between the age of first use of tobacco and the age of first use of alcohol and marijuana. There is a positive correlation between tobacco use and alcohol use. The more frequent smokers drink more alcohol.