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Objectives. Young adults may use cannabis for distinct reasons, for example, related to their personalities or lifestyles. This study examined young adults’ personality profiles and associations with cannabis use-related outcomes. Methods. Using 3 waves of survey data (2023–2024) among 4,031 US young adults (Mage = 26.29, 59.8% female, 19.4% Hispanic, 14.0% Black, 14.1% Asian), latent profile analysis was conducted based on 5 personality characteristics (emotional stability, extraversion, openness, agreeableness, conscientiousness). Generalized estimating equations assessed class in relation to past-month use and use intentions and their changes over time. Models controlled for state non-medical cannabis legalization and sociodemographics. Results. Three classes emerged: 1) the All-high-trait class (highest scores on all 5 personality characteristics; 21.1%); 2) the Moderate-extraversion/low-other-trait class (37.1%); and 3) the Low-extraversion/moderate-other-trait class (41.8%). At W1, past-month cannabis use was higher in the All-high-trait (52.2%) and Moderate-extraversion/low-other-trait classes vs. the Low-extraversion/moderate-other-trait class (43.3%). At W1, compared to the All-high-trait class, Low-extraversion/moderate-other-trait reported lower odds of use (aOR = 0.75, 95%CI = 0.63–0.90), and both Moderate-extraversion/low-other-trait and Low-extraversion/moderate-other-trait reported lower intentions (Moderate-extraversion/low-other-trait: B = -0.22, SE = 0.07; Low-extraversion/moderate-other-trait: B = -0.28, SE = 0.07). While odds of use and intentions generally decreased overall, class-by-time interactions indicated that: 1) odds of use decreased less from W1 to W2 in Low-extraversion/moderate-other-trait vs. Moderate-extraversion/low-other-trait (aOR = 1.23, 95%CI = 1.07–1.42); and 2) use intentions increased more from W1 to W2 in Moderate-extraversion/low-other-trait vs. All-high-trait (B = 0.18, SE = 0.09) and decreased less from W2 to W3 in Low-extraversion/moderate-other-trait vs. Moderate-extraversion/low-other-trait (B = 0.15, SE = 0.07). Conclusions. Intervention efforts should consider distinct personality profiles of young adults and potentially distinct mechanisms (e.g., social, emotional) underlying their cannabis use. 

Cross-plane heat transport is a critical bottleneck for van der Waals (vdW) electronics, yet its microscopic governing principles remain elusive. We demonstrate that stacking order is an effective control knob for cross-plane phonon transport in multilayer rhenium disulfide (ReS2). Thickness-dependent thermal conductivity measurements reveal remarkably long cross-plane phonon mean free paths (≳200–300 nm) and provide a direct experimental observation of the transition from quasi-ballistic transport to a ballistic regime characterized by thickness-independent thermal resistance. AA stacking exhibits nearly double the cross-plane thermal conductivity of AB stacking, driven by longer acoustic phonon lifetimes associated with the more closely aligned interlayer registry of AA stacking. Deep-neural-network-based molecular dynamics simulations reveal that phonon filtering in ReS2 is fundamentally frequency-selective: weak vdW coupling acts as a low-pass filter, whereas stronger coupling broadens the transmission passband. These results establish ReS2 as a model system where stacking order and interlayer coupling can be engineered to tune heat conduction across diffusive, quasi-ballistic, and ballistic regimes, offering a new framework for thermal management in two-dimensional electronics.