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.
Peppers and Chilies. Similar to tomatoes, peppers and chili peppers make for great greenhouse crops, and you have so many options when it comes to what you grow. Bell peppers are versatile and can be used in all kinds of foods, including salads, and you can grow them in all different colors to add variety.