I don't actually understand why any drugs are illegal anyway.
Surely the argument for allowing people to smoke or allowing people to drink alcohol is equally as valid for somebody wanting to smoke marijuana or snort cocaine?
Besides, most of the "negatives" are a result of the fact that these drugs are illegal. For instance, if cocaine was legal, and was readily available at Tesco or Boots, then there would be testing agencies, it wouldn't be cut with all sorts of dodgy stuff, and ultimately much of the organised crime that revolves around this trade would die out.
In fact it would open up an entirely new industry and create thousands of jobs in perhaps specialised drug-retailers, drug production companies, drug crop farming, and so on. Think about all the extra tax that would be generated by VAT on drug sales, too.
The problem is that illegal drugs are stigmatised far more so than cigarettes or alcohol, especially class-A drugs, which are classified on no scientific basis whatsoever anyway.
The fact that some potentially harmful and open-to-abuse drugs are legal (tobacco, alcohol) and others illegal (cocaine, heroin, LSD, ecstasy, marijuana, etc.) is absolutely preposterous from a purely rational perspective, and this is coming from somebody rarely ever drinks alcohol and has no intention of using any of tobacco, marijuana, cocaine, etc.