In DSM, nicotine dependence is included under the general definition of substance dependence.  The essential feature of Substance Dependence is a cluster of cognitive, behavioral, and physiologic symptoms indicating that the individual continues use of the substance despite significant substance-related problems.
The Best Materials to Cover your Greenhouse. 1  Glass: The traditional greenhouse covering, glass is the preferred material for permanence. 2  Film Plastic: Film plastic is one sixth to one tenth of the cost per square foot of a glass covered structure.
1 Cold frames can also be constructed for free using recycled materials. 2  For more details, see How Much Does a Portable Greenhouse Cost. 3  An indoor greenhouse can cost $3-$60 for a windowsill or tabletop kit with a container and cover; more expensive models may include a heat pad under the container, or a grow light. Cold frames can also be constructed for free using recycled materials. 2  For more details, see How Much Does a Portable Greenhouse Cost. 3  An indoor greenhouse can cost $3-$60 for a windowsill or tabletop kit with a container and cover; more expensive models may include a heat pad under the container, or a grow light.