Police are urging youngsters not to take legal highs being sold across Lincolnshire.
And they are highlighting the dangers of one particular product called Exodus Damnation.
The ingredients are the same as those found in moss killer and floor paint.
It has caused violent side effects in teenagers elsewhere in the UK, with police being called to help ambulance crews.
At one incident, two 17-year-olds wrecked their home and tried to jump down stairs and out of windows.
They had taken Exodus Damnation using a bong, causing what ambulance crews described as ‘severe delirium’.
When they were restrained, they fitted and overheated.
In another incident an ambulance crew called the police because an 18-year-old man was being violent and aggressive towards them.
With paramedics present, he bit his father on the face, ripping off his lip and part of his chin.
He also caused extensive damage to the ambulance.
Hospitals have also reported an increase in patients who have these substances complaining of palpitations, chest pains, panic and breathing difficulties.
Legal highs are on sale at various outlets, including dedicated ‘head shops’ across Lincolnshire.
The industry is not regulated and the products are not tested. Many contain harmful substances and even illegal drugs.
Police are warning of the dangers of these substances after local schools said they suspected a small number of pupils were attending lessons under the influence.
But they are somewhat powerless to control it because they are not classed as illegal.
The police can only take action if illegal drugs like M-CAT are involved.
Lincolnshire Police said that premises had been visited and substances seized in recent months.
But if they do not contain illegal drugs, even though they are harmful, there is little the authorities can do to restrict their sale.
The force said that other options were currently being explored by various local agencies with a view to improving the situation.