at the moment ive got this thing where you turn the base, it clicks and then you suck the **** out of it. if you give it about 15 clicks you get the shakes and feel a bit queezy
Word of warning, I used to go out with a chronic astmatic (she had three puffas Ventalin, Becotide and Intal) and had hormone treatment as a kid..... she ended up with massive boobs!