Cohort study (follow-up of participants in the ECTEC study). The subjects of the study are all participants in the study, composed of students of the Nursing Degree from the 15 University Schools of Nursing in Catalonia during the 2015-2016 academic year who have accessible emails at the time of contact (n= 3,709). A structured online questionnaire will be used in which the following will be analyzed: the consumption of tobacco products, electronic cigarettes and cannabis, knowledge about smoking, attitude towards smoking as a health problem and training received during the nursing degree. The relationship between the variables studied and their 95% confidence interval will be studied. Changes in consumption between the baseline survey (2015-16) and the follow-up (2018) and their determinants will be studied using Cox proportional hazards models.