I don't think that there is any inherent evil in drug use or addiction. Society is what demoizes illicit drug use. Before the criminilazing of drug use in the western world over a century ago, men and women were free to indulge and kill themselves with drugs of their own accord, which is how it should be. Ethanol and Nicotine are still legal after all...
With that said, the same decision that you have come to in forgoing the feelings of society, your friends and family and in some cases your own health is a big deal isn't it? If you're willing to say fuck it to all of that and try hard drugs, don't you think you will most likely lack the self-control necessary to maintain your habits as only "weekend" material? Again, I don't feel there is inherent evil in the use of drugs, but our decision to use these types of substances are not to be taken lightly. We cross many boundaries when we choose to partake in these desires.