why on earth would anyone want that to happen just to chase a feeling.
Why does anyone want to do anything?
The trouble with many staunchly anti-drugs opinions is that they are often created by a close personal loss or impact on family of drug use. (You could say the same thing about race car driving, sky diving and many other things people do to 'chase a feeling' as you put it)
Whilst this experience doesn't make the opinion any less true for those who hold it, it does not make it objective.
Most of our laws regarding drugs are not objective, but are (excluding workplace safety and liability issues) based on morality and perceived decency - look at how many things were legal a hundred years ago, until it was decided that the dire social problems illuminated by drug and alcohol use could be tackled by prohibition, temperance and religion?
It did nothing to remove the social problems, just the masses means of escape from them.
Fact of the matter is the current 'war on drugs' is an abject failure. It would be a far better thing to decriminalise most currently illegal drugs and have the harder drugs proscribed by gp's to those who are genuine addicts, cutting off their need to steal/mug old ladies to feed their habit.
Not to mention it would be a great source of extra government revenue via taxation in these hard times of austerity - I've yet to see a politician baulk at a way to raise some cash, unless it threatens their public profile
But in many cases of casual use, what we are really talking about is taking personal responsibility for your actions. I do it every time I choose to have a drink and then not to drive my car. I look at the situation and act accordingly. The same should go for those with jobs that involve issues of safety or liability of safety for others. But of course taking responsibility for your own actions is something that is not reinforced as an attitude these days; it's always someone else's fault or responsibility or blame.
If you want to be recreational in your use of drugs, choose a career that your fun is not going to endanger anyone else, or a career where you are not responsible for the safety of others. That's how I've always looked at it.