When you are conditioned by drug use to experience life in an altered state--either heightened emotions or numbed emotions e.g.--the adjustment to experiencing life simply with the five senses you were born with can feel lackluster in comparison. That comparison is where the thinking gets muddled IMO.
Sekio's advice to get new friends, new hobbies, new interests or career is not simplistic at all. How easy is it to change all that up? It's not easy and the rewards are far greater for that very reason. The difference is that a drug changes things in your experience instantly whereas life changes and internal changes happen subtly over time. My ability to experience happiness, bliss and even ecstasy has continued to deepen over a whole lifetime. When I was young I wanted everything to happen NOW. The problem was that it was never enough because enhancing one moment sucks the air out of the following moment; you never have the chance to let a larger beauty unfold. Finding the abundance of possibility surrounding you every single moment that you are alive is entirely possible. It is all about your thoughts and those often are more habitual and reactionary than you think. Study your own thoughts. Play around with them. Learn life's rhythms and your own and watch the interplay. Find a creative outlet that resonates in you that involves both body and mind--art has a way of deepening living profoundly.
@atara: I am going to be laughing over "break into the neighbors' house and clean
their floor" for a long time! Next time I need an adrenaline rush I am going to consider breaking and entering with the added enhancement of domestic satisfaction.