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Some 31.3% of children grow up in an environment where at least one parent consumes products containing nicotine every day, such as tobacco or electronic cigarettes. The proportion of children whose parents use illegal drugs (cannabis, cocaine, heroin) is 1.8%, which Obsan considers low. In 2011, Switzerland changed its laws on cannabis, permitting adults to buy and use cannabis with up to 1% tetrahydrocannabinol (THC) – the active ingredient that gets smokers high.