99% of all addicts are liars and thieves. This might sound unfair and even close-minded, but it's the truth. There are some exceptions to the rules, but they are incredibly rare. Most people are no match for their addictions. They will be driven to do things they would normally never have considered all in the name of getting high. Sad, but true. So if you're thinking of trying drugs, keep in mind that all the people you will be dealing with are likely to steal from you and lie to you at your own expense.
I can pretty much guarantee that you will at some point find yourself doing something that at one point you swore you'd never do. You'll do it for the sake of getting high, either directly or indirectly. Trust me. It will happen. You might think you know yourself better than anyone, but you have yet to become acquainted with your addiction. It will introduce itself in ways that you never thought were possible.