Sounds like you've never taken steroids brother, and with that mindset you shouldn't, because I'll tell you that no matter how much you shoot into your muscles, if you don't put in the work in the gym, there's no way you're going to get jacked.
You will gain some additional contractile tissue doing nothing on gear. The average person, if faced with the two options, will gain more actual contractile tissue opting to lift weights without gear.
You can find huge quantities of people in gyms that are on gear and look like they barely lift.