One thing I will tell you is to wait at least 20-25 minutes between each hit. Any less and it's just a waste IMHO. Also, when I drink a couple beers before smoking I tend to get a better effect. Maybe not stronger perhaps, but a better feeling overall, if that makes sense. Not sure how experienced you are with crack but theres also the obvious things like hold in for as long as possible, etc, etc... If you are new to this then I recommend trying the BL search engine and i'm sure you will find some good threads with crack smoking advice.