Abstract
The combined use of cannabis and tobacco is frequent in Europe. Few studies have nonetheless explored this pattern of consumption and its relationship with academic achievement in Spanish population. The aim of the present study was to analyze (1) the frequency of four patterns of polydrug use the last year (non-dual users of cannabis and tobacco; concurrent users: cannabis and tobacco separately; simultaneous users: tobacco in cannabis “joints”; simultaneous users: tobacco in cannabis joints alongside alcohol) by gender and age; (2) grade point average (GPA) by gender and age; (3) the association between the frequency of the four patterns of use and the GPA amongst a sample of 477 Spanish university students. The use of cannabis and tobacco (concurrent and simultaneous) and GPA were assessed by means of self-reported questionnaires. Statistically significant differences were found for the GPA with respect to gender. The GPA by the non-dual users of cannabis and tobacco was significantly higher than the GPA corresponding to the concurrent and simultaneous users. The combined use of cannabis and tobacco, regardless of the type of use (concurrent or simultaneous), is moderately related to poor academic achievement amongst university students.
Highlights
Cannabis and tobacco are two common drugs often used in combination, especially “tobacco in cannabis joints”, in Europe [1,2]
The grade point average (GPA) by the non-dual users of cannabis and tobacco was significantly higher than the GPA corresponding to the concurrent and simultaneous users
Most of the research conducted on university students has focused on analyzing the effects of cannabis or tobacco separately, with few studies focusing on their combined effects: the effects of the combined use of cannabis and tobacco on academic achievement may meaningfully influence the eventual success of future students
Summary
Cannabis and tobacco are two common drugs often used in combination, especially “tobacco in cannabis joints”, in Europe [1,2]. Many of the studies performed in Spain do not distinguish between concurrent (i.e., separately smoking cannabis and tobacco within a given time period) and simultaneous (i.e., smoking cannabis in a “joint” or “blunt” with tobacco on a single occasion) polydrug use. Researchers have generally ignored these patterns of use of cannabis and tobacco. This distinction is important since the use of cannabis mixed with tobacco, in comparison to smokeless forms, is more likely to develop cannabis dependence [3]. Most of the research conducted on university students has focused on analyzing the effects of cannabis or tobacco separately, with few studies focusing on their combined effects: the effects of the combined use of cannabis and tobacco on academic achievement may meaningfully influence the eventual success of future students
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