Fig. 1
![Fig. 1](http://media.springernature.com/full/springer-static/image/art%3A10.1186%2Fs12935-018-0678-9/MediaObjects/12935_2018_678_Fig1_HTML.png)
Effects of water-pipe smoking (WPS) on colony formation in human breast cancer cell lines. WPS slightly enhances colony formation of MCF7 and BT20 cell lines in comparison with their control cells. Clonogenic cell assay and WPS exposure were performed as described in “Materials and methods” section