>Is it just an availability thing?
Sure. Probably a good half of the drugs in use today did not even exist 50 years ago.
I disagree about drugs being a city thing, though. If you count niggers, maybe, but in my experience, rural areas can be worse than the cities for drug use, especially hard drugs like crystal meth and heroin, which is making a comeback apparently. As for causes, you have many factors. As mentioned, lack of economic opportunities. Selling drugs can pay far more than the average small town McJob. Another is lack of wholesome activities or entertainment. The "get money, fuck bitches" lifestyles on the talmudvision don't line up with the realities of rural life, and they may feel the need to go to extreme lengths to "get that dolla" and get away to the big, diverse city with all its exotic delights. Or, simply tuning out and checking out. Or, escapism not from a shared societal problem, but perhaps domestic ones, like alcoholism and physical and sexual abuse, often sharing roots with drug abuse itself. Media glamorized drug use imagery. Internet hyped drug use imagery. Immigrants, physically bringing the drugs and selling them often being their only viable form of employment, being the subhumans they are. The list goes on and on.
The causes are many, and trying to tackle or even enumerate them all can seem like a lost cause. A wise man once wrote, "The art of leadership, as displayed by really great leaders of the people throughout the ages, consists in concentrating the attention of the people against a single adversary and taking care that nothing will divide that attention." You must pick one cause, raise the alarm, rally forces against it, and defeat it. A demoralizing agent will tell you that you are fighting a hydra, and that there will always spring up more heads: causes you didn't know existed or even entirely new ones, so all your effort has been in vain. The reality is different. Addressing a single cause and successfully addressing it is a breech in the lines; your enemies are caught off-guard and divided, and you have a victory and momentum on your side.
If this is an issue near to you, as it should be to all of us, let us know where you want to strike, and we will help you any way we can.