Hi aussiechick,
Using the maybe baby at the moment have found it very EASY to use as long as you follow the guidelines. For a smoker that maybe difficult. as for me its hard cause i'm a coffee fiend. so you get up, and do it one hour withinr rising nand dont eat,brush teeth or coffee. then wait till the same is completely dry. I usually go shower and blowdry my hair,get dressed then look. so about an hour. I found that if the sample isnt 100%dry you can get different results..Anyway i'll be alot more satisfied with its success when i'm pregnant..lol .

Pauline