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7 MPa), circumventing the trade-off between toughness and stiffness. This work is expected to impact many fields of engineering requiring elastomers with unprecedented mechanical performance. To determine compliance with North Dakota's smoke-free law in vape shops and other tobacco specialty shops selling electronic nicotine delivery systems (ENDS) or e-liquids. In this 2019 descriptive study, shops (n=35) were assessed for compliance with the smoke-free law by observation of indoor and outdoor areas for smoking or vaping, or evidence of such activity in pr