This stool appears liquid with significant foam, corresponding to Bristol Type 7. While the color is normally brown, the excessive foam suggests high water content. Given your current smoking habit, this type of stool warrants attention, and it would be advisable to consult a doctor to check your digestive health.

It appears to be diarrhea, resembling liquid. The presence of foam might indicate digestive issues. Increase your fluid intake and avoid irritating foods.