## 3 Results
### Interventions  
This scoping review synthesizes findings from studies that combined VR headsets with aromatherapy interventions to create immersive sensory experiences for recreational and therapeutic purposes. The VR hardware used in these studies included a range of devices, each contributing to different types of virtual environments. [PERSON] [38] employed the Oculus Quest VR headset to offer immersive nature-based experiences. [PERSON] [21] utilized 3D VR helmets, pairing these with virtual environments but without specifying the associated aromas. [PERSON] [37] used a head-mounted display (HMD) paired with Xiaomi VR glasses to create a market environment, integrating fruit and meat aromas into the experience. [PERSON] [35] designed a bespoke VR system with 360-degree video, which was complemented by pine scents to enhance the virtual environment. [PERSON] [39] employed VR-NatureTM alongside a nature-centric setting, incorporating pine needle scents and essential oils. One study by [PERSON] [36] did not specify the VR hardware used, but it involved a virtual green environment enhanced with woodland aromas via an aroma diffuser.  
The aromatherapy interventions varied widely across studies. Specific details regarding experimental setups, such as concentration of aromas, ventilation of the space, and setting sizes, were generally not reported. Some focused on nature-related aromas, such as pine scents, which were used in studies by [PERSON] [35] and [PERSON] [39], the latter alsoincorporating essential oils. [PERSON] [37] explored a more diverse approach, using fruit and meat aromas to enhance the sensory impact of a virtual market. [PERSON] [36] employed woodland-based aromas, which were released through an aroma diffuser within the virtual environment, while [PERSON] [38] also used nature-based aromas, though no specific scents were detailed. These aromatherapy interventions were often tailored to match the virtual setting, enriching the multisensory experience. In summary, only two studies described the congruence between VR content and aroma in detail, specifically linking forest scenes with the scent of pine and market scenes with the scents of meat and fruit [35; 37]. Another two reported congruence without details on the essential oils they used [36; 39], while the last two studies did not achieve congruence between VR scene and aroma [21; 37].  
The combination of VR and aromatherapy led to unique immersive experiences. For instance, [PERSON] [39] created a forest bathing experience where participants listened to nature sounds, held stones, and inhaled pine scents while engaging with the VR-NatureTM system. [PERSON] [35] similarly combined pine aromatherapy with tactile interactions, providing participants with forest objects like twigs and leaves to enhance the sensory experience. [PERSON] [36] compared VR with a multisensory sensory environment (MSSE) by having participants view virtual woodland or coastal settings on a 180-degree screen, touch objects related to the scene, and inhale corresponding aromas released from an aroma diffuser. These studies highlight the innovative ways in which VR and aromatherapy are integrated to offer immersive and therapeutic experiences.