What is unhealthier?

Shisharauchen allows “the ten-fold dose” of carbon monoxide to be absorbed against cigarettes, which is not sufficiently known. However, the BfR comes elsewhere to the conclusion that (average) cigarette consumption is proven to be more harmful than (average) water pipe smoking. However, the decisive difference is the lower average consumption of ‘one to two water pipes per week’ compared to ‘20–30 cigarettes per day’.

→ https://de.wikipedia.org/wiki/Shisha