The older I get the more I appreciate the privilege of growing up in a strong loving family who instilled ethics and values.
Amen to this!
That's right - I'm back mwahaha! Rested and phone charged. Ahem, sorry.
I also completely agree with and value your comments Chista. It is clear that you have a lot of compassion and admiration for what people who have been unlucky enough to fall into addiction can be capable of. Funny how the person who probably sees the most addicts has the most compassion for them and sees them as human beings, while there are those would wouldn't let a "smackhead" 
come near them even if they are clean, because ew a druggy!
I don’t believe all of them have actual addictive personalities to start with. I believe a lot are just risk takers as most teenagers are. But many teens choose NOT to let a sniff of weed past their nose because they have decided the risk is too great.
I don't even know what an addictive personality really means tbh... I think there are very damaged people who for one reason or another turn to something else. It doesn't have to be illegal drugs either. Naice mummies in my acquaintance regularly drink far too much alcohol.
And yes, there are some teenagers who never let a sniff past their nose, or who never so much as smoke a cigarette. More and more teenagers these days are teetotal too. But why? Why do they just not bother? That will come down to their circle of friends, predisposition and circle of friends.
No teenagers where I grew up touched any drugs other than the odd person who smoked weed. So obviously, as a teenager, I was highly unlikely to try drugs and I didn't. But that was my good fortune. It simply wasn't an option. I'd have had to have gone out and sought to buy drugs, on my own. Wasn't going to happen.
Then there are the many teenagers and young adults who, like I once did, try drugs at one point or another, (at university for me, so not near home), but who don't especially like it and don't think "more, more, more". They think "actually no, not for me thanks". Again, the lucky ones.
Some people click with a drug I think. Maybe it's someone who lacks confidence who suddenly feels artificially confident all of a sudden and thinks "I can't stop taking this". That goes for alcohol as well. They are the unlucky ones.
If you're someone who never tries drugs or alcohol or gambling or anything else, which can become an addiction problem. Yes, you obviously remove all the risk. But I don't think that is common. Most people do one or more of those things at some point.
Alcohol is especially dangerous and has been classed by experts as more harmful than heroin, (I know, I know; it's always trotted out on these threads, but it is true). I know people who are and who have been alcoholics, so it is the addiction I am most familiar with and it is a dreadful thing. I know though, that people who are suffering with alcoholism are just less fortunate than I am in some way. They have found their 'poison'. I am extremely lucky that I either am not predisposed to become addicted to it or something else has meant I am more fortunate.
Yes, it's a choice to start drinking. Social drinking, then "mummy needs wine" every day and before you know it... For some people, obviously.
Same with drugs. It is a choice at the beginning, for most people, but it is much, much more complicated when you try to figure out why some people never try it, why some people try and think "nope", why some people party a lot and take drugs 'recreationally' a lot, but then, grow up, stop with no bother and go about their lives and then, why some people get really into drugs and become addicts.
It isn't as simple as "you chose to try drugs once or twice. That's why you're an addict". There is so much more too it, or else there would be a lot more drug addicts in this country. Public figures, models, actors, pop stars, every person, and there are many, who ever let a sniff past their nose or took a draw on a spliff.