Yoghurt with fruits was served in earlier days at the coffeshops as a quick and nice inbetweeny. Those who know about smoking are aware that the bloodglucose level drops rapidly after THC consumption, and this was a refreshing solution to the drowsy feeling.
The filtertip is used when rolling a joint in order to prevent inhalation of pieces of tobacco . It comes in many sizes and materials, mostly carton. Standard issue is 60 by 20 mm, with a thickness of 170gr/m2. Some like to use a thinner variation for easier rolling that comes as 120gr/m2.