Many of them are produced inside the EU and the substances used for their production ('precursors') are legally available, creating so-called 'legal highs'.
Paljusid neist toodetakse ELis ning nende valmistamiseks vajalikud ained (lähteained) on seaduslikult kättesaadavad – seetõttu kutsutaksegi neid nn seaduslikeks mõnuaineteks.