Boston Tea Party has said its ban on single-use takeaway cups has led to a £250,000 fall in sales in the past 10 months.
The independent West Country coffee shop chain introduced the ban across its 22 shops in June 2018. At the time it said that takeaway hot drinks were responsible for 5.2% of the chain’s £19.8m turnover.
Owner Sam Roberts told BBC News that it had factored the loss, which represents 25% of coffee sales, into its plans and that too many operators were "putting their profits before the planet".
Roberts called on other chains to follow Boston Tea Party’s lead, adding that schemes that reward customers who bring a reusable cup have a low rate of take up.
"There's too many operators not dealing with the problem and putting their profits before the planet,” Roberts said. "At the moment bigger businesses are deploying a smoke and mirrors strategy and not resolving problems while seeming like they are doing something about it. We are 100% committed and there's no going back."
Boston Tea Party customers wishing to take away a hot drink can either bring their own reusable cup, purchase one at the shop, or pay a deposit on a cup they can return to any branch.
The business says it has prevented almost 125,000 cups from going to landfill since introducing the policy.