[soudiere]

People who do a lot of meth tend to smoke it.

Method of administration affects the time delay for euphoria. Smoke > Shooting > Eating.

People who do a lot of meth (or drugs outside of a prescription) tend to do as much as they can purchase and/or tolerate.

When you see someone who has a doctor (dealer) that gives them as much adderall as they want, illusions of differences between the two drugs rapidly fade. I'm talking about 100+mg a day, I've seen it happen, still have 50mg adderall pills from the person in the story.