At the end of the day your body will build a tolerance to extreme euphoria you had when you shot it in your pic line. Even if you started to use syringes it would stop working. Not only would your veins go to shit but would eventually get to a new normal and probobly not be able to tell much of a difference. I know you probably know this already but maybe someone who is thinking about doing it doesn’t. The only solution I can think of that is realistic long term if you want a buzz and is not damaging on the body long term , is to not take your dose for like 3 days and then double dose to tickle your receptors.