//Some people have more willpower than others//
Trust me, its got nothing to do with will power.
Ive known addicts (of all persuasions) that have had more will power in their lives than you have in your little finger and could have had fantastic lives, but when it comes to their own addictions have died.
Just that one chemical substance that they havnt overcome...
//Stupidity probably features in there somewhere//
It doesnt!
An abused childhood, bad parenting, low self esteem, mental problems, etc.
Anyone in their right frame of mind doesnt partake, and continue to partake, in a destructive substance that will eventually lead to their death.
Nothing to do with stupidity...thats a schoolkid's take on it.
Addiction is more complex than that.
Just wish I knew the answer.