The hardening of the European laws on tobacco, implies the necessity to change strongly established social habits. The promulgation of a law does not suppose its monitoring if there are not control mechanisms or a high degree of personal and civic conscience on the necessity of its fulfilment. Although the Catalan law forbids to smoke in educational settings from 1985, this law is only strictly respected inside the classrooms, but not in common corridors and public places. Also, certain level of conflict has been detected between smokers and non-smokers. Due to this problem contributes to generate internal contamination of the buildings, an environmental campaign was impelled to the environmental commission of the Mundet Campus (Universitat de Barcelona). The request implied forecasting and executing a pilot plan for setting spaces for smokers. These spaces have been called ‘Yellow Points’ and their objective have been to release of smoke the building of the Psychology Faculty. In addition, a persuasive communication campaign to respect the ‘Smoke-Free Places’ was designed and executed.It was considered that the traditional signalectic that forbid to smoke (the striped cigarette in red) act as an instigator for smokers that conduct to fail in the fulfilment of the norm if there is not a strong social control or an established habit of not smoking in the specific place or in that typology of places. In addition to the necessities derived from the physiological habit attaching to the tobacco, when the smoke habit exists, the unconscious imitative behaviour is a strong inducer of the act of igniting a cigarette. Thus, the presence of few persons that break the norm of not smoking triggers its total breach. The information on the injurious effects of the tobacco on health is sufficiently disclosed, with relatively poor effects in the smoker behaviour, aside from generating reluctant feelings.Having in mind these considerations and previous experiences of failure in the same centre, the characteristics of the smoker places were delimited, their location and accessibility, the typology and location of signalling, as well as, the messages and prompts to communicate. The model of ‘The 4 Spheres’ (Pol, 2000) was used as the theoretical framework which emphasises the convenience of considering cognitive, emotional, functional and social control dimensions in any intervention whose objective is influence human and social behaviours in the environmental management.On the first stage, the communicative axis consisted of positive messages oriented more to emotive and functional dimensions (as practice) than to rationality (there is sufficient information of the effects of the tobacco). The messages were accompanied by performances (theatre and music) in the ‘Yellow Points’ during the breaks oriented to generate habits, maintaining them by mechanisms of social influence and contributing to the appropriation and positive attribution to smoker places. Before the campaign, that places were considered crossing sites (such as corridors, halls, etc.) of certain marginal nature (sociofugal) and the objective was to change the symbolic meaning attributed to them, turning them in sociopetal places. This was obtained playing music during performances and locating spending machines in these places.Based on a quasi-experimental design, periodical measures ‘pre’ and ‘post’ intervention were registered. This allowed us to evaluate the environmental marketing effects in the smoker behaviours, such as the degree of fulfilment and breaking of the norm. As it is usual in these cases, we obtained acceptable answers during the initial steps of the campaign, which decreased with the time. Measures of remembering and reinforcement were taken when a low respect to the norm was detected. The results suggest that users density (functional and social influence spheres), antiquity in the centre and identification with the institution (emotional sphere) seems to be relevant factors in the explanation of the positive respect to the norm.