The persistent myth is: Drugs only change behavior, not personality. In reality, regular use shifts the internal screws of motivation, emotional regulation, and stress tolerance – and thereby alters the "who-am-I-in-relation-to-others." A concerning correlation from current research also shows: With the spread of new psychoactive substances, sudden deaths and related violence have significantly increased in Europe, especially during the pandemic years ^[1]. This is not a side note but a signal of how profoundly substances shape social dynamics and connections.

“Drug personality” is not an official diagnostic label, but it describes an observable pattern change in feelings, thinking, and actions under sustained substance use. Three processes are central: First, the drive for reward from the substance becomes stronger, which can devalue everyday goals – maintaining relationships, work, training. Second, emotional regulationability to manage emotions appropriately to the situation suffers, often accompanied by increased stress reactivityexaggerated physical/mental response to stress. Third, self-controlexecutive functions such as impulse control, attention, action planning decreases, as networks in the prefrontal cortexbrain area for planning/regulation are weakened. This triad operates socially: intimacy demands reliability, emotional balance, and perspective-taking – exactly the functions that become fragile under substance influence. Isolation then becomes both a result and a magnifier, as the lack of social resonance further fuels cravings.

At the relational level, three risk pathways emerge. First, social decoupling: Loneliness increases vulnerability to substance use and vice versa – especially opioids interfere with biological systems of social bonding, disrupting "social homeostasis," making retreat and further consumption more likely ^[2]. Second, aggression and violence contexts: New psychoactive substances and stimulants correlate with increases in violence and sudden deaths, putting couples and family relationships under high stress in terms of safety and trust ^[1]; additionally, the risk of becoming a victim of violence is significantly increased in the general population with methamphetamine use ^[3]. Third, psychological dysregulation: Addiction is associated with negative affect and stress hyperarousal; weakened prefrontal control networks complicate conflict resolution and ability to compromise – catalysts for relationship breakdowns and team dysfunction ^[4].

Randomized training studies show that brief mindfulness interventions increase activity in the anterior cingulate cortex and medial prefrontal cortex – regions that support self-control and emotional regulation. Both smokers and non-smokers benefited from better emotional regulation and less stress; for smokers, previous deficits partially normalized after the training. This supports the idea of mindfulness as a targeted rehabilitation of the control network – and thus as a relationship booster through improved impulse control and de-escalation ^[4]. Additionally, a study with at-risk students indicates that a very brief mindfulness session acutely reduces negative affects and increases mindfulness, but these effects do not remain stable without further deepening – a hint that dose and continuity matter when trying to change relationship patterns sustainably ^[5]. Parallel to this, observational and forensic analyses link the availability of synthetic drugs with violent events and sudden deaths; while causality cannot be conclusively demonstrated, the cardiovascular and neuropsychiatric toxicity makes the connection biologically plausible – and socially consequential ^[1]. Finally, population-representative data show a higher risk of becoming a victim of violence with methamphetamine use, even after controlling for relevant influencing factors. This underscores that substance environments not only strain relationships but also create safety risks ^[3].

- Train mindfulness as a regulator: Plan 10–15 minutes of “focus breathing” daily. Direct attention to the sensations of breathing, name emerging impulses (e.g., "urge," "worry"), and return to the breath. The goal is not relaxation but emotional regulation and impulse control – skills associated with increased ACC/mPFC activity and less stress in studies ^[4].
- Micro-intervention before sensitive conversations: Two minutes of “3×3 check-in” – take three deep breaths, locate three bodily sensations, formulate three needs. Short formats reduce acute negative affect; for stable effects, regularly repeat and deepen ^[5].
- Aerobic foundation for brain plasticity: Walk briskly, jog, or cycle for 20–40 minutes three to five times a week. Aerobic exercise increases BDNF, promotes neuroplasticity in the hippocampus, and improves mood and attention – building blocks for conflict resolution and bonding ability ^[6].
- Training as a relapse buffer and mood stabilizer: Integrate moderate exercise sessions firmly into the weekly schedule during ongoing SUD treatment. Studies show moderate improvements in stress, depression, and quality of life; even without assured craving reduction, this contributes to more stable relationships and everyday functionality ^[7].
- Actively build social architecture: Combine exercise with community (running group, club) to counter loneliness risks and strengthen social homeostasis – a mechanism especially relevant in the context of opioids ^[2].

Personality is malleable – even under the influence of substances, but in both directions. Train emotional regulation (mindfulness) and neuroplastic resources (endurance training) to make relationships stable sources of strength again. Start today with 10 minutes of breath focus and a 20-minute cardio window.