i've found it's all ways been about cost.
when i was young(20 years ago)i bought a gram at a time,and always mixed weed with tobacco probably 3/1in favour of tobacco.
first time i went to amsterdam it went down to 1/1 weed tobacco.
last time in the dam it was 90% weed to tobacco.
now i grow my own so its usually 100% weed in fan leaves,but it was always a cost issue,tobacco cost about 10$ for 20 in the uk now so tobacco's to expensive for me to use anyway!