|Khat or Qat|
Some have suggested that by making a drug popular with certain immigrant communities illegal, then the number of convictions of people in those communities will increase and allow for an increased number of deportations from those communities.
It would be interesting to compare recreational drugs with other recreational activities, in terms of damage done. Whether it Rugby, Football, Motor racing, mountain climbing, dancing, high heels, parachuting etc. All of these things or activities are considered by some "proper fun" but all of them create some damage to the user and have the potential to have effects beyond the individual with through them being obsessive or been injured falling off the high heels or mountains. Deaths are not unheard of in these kind of activities, the danger is part of what attracts people to these things. The stimulate part of the brain, they have little or no other purpose, often they do not even add to your fitness or life expectancy.
The way this proper fun works is by causing chemical changes in the brain, these changes can produce many different effects and while the moderate stimulation of them is good providing feedback to allowing people to continue dangerous but needed task, to construct unneeded task simply to produces these biochemical changes is no more or less natural than taking any drug to produce similar changes, properly controlled taking the right drug produces the right effect without the danger of mutilation and injury.
The ban on drug sales has produced a black market which is unregulated the true dangers come from not being able to take what you desire because there is no monitoring of the market. Parachuting and mountaineering would become a lot less popular and a lot less safe if the equipment was produced in the black market and had to be smuggled around and kept hidden and if dealing such equipment would put you in prison.
Societies reason for the differentiating between "real fun" and "drug fun" goes back to religion which has us as something other than a complicated chemistry set, on legs, while there are substances and activities which are so dangerous to the individual and society we should control them, there are many that we should not. The decision as to which is which should be left to independent bodies not to political entities look for votes or to please their own pseudo religious views.