It's not knowing how addictive they are or worse still how addictive YOU are. Once you find them, buy them and take them, then realise that they are giving you a better buzz, rush or chill than there illegal counterparts...... it's to late you just won't realise. Being addicted to these chemicals can be much much more difficult to shake than most illegal drugs. Point to the fact that illegal drugs from a drug dealer on the street (with a risk of prison) are now safer than something bought from a sweet shop, and yes I have also fallen foul of these chemical replacements. I used herbal replacement for pain relief for a very serious condition and to my amazement they worked, and better than weed but then found the addiction. Just believe me people "legal highs are more addictive and more damaging than the real deal.