Astoria said:
Everyone I know who's done harder drugs has started with weed. It had nothing to do with it being illegal, they just wanted to try harder and harder drugs.
Everyone I know who has done hard drugs did not start with weed. Your small sample source has no validation whatsoever. Studies show that BECAUSE it is illegal users have other illegal substances made aware to them and provided to them. If it was in a store and you went to buy it the owner wouldn't say 'wanna try some cocaine too?'
TL;DR it IS due to it being illegal; in a black market environment you are exposed to numerous substances. I have smoked for years and it is ONLY due to it being illegal that I have been introduced to other substances simply because they are also illegal. I do not partake in them, and have no desire to. I honestly don't want to start an argument; I am merely stating facts and speaking from personal experience having smoked it myself for years and doing MUCH research on the topic, mainly from professionals and medical sources.